<p>These questions are from section 4 of test no. 3, CBs online course:
The part is brackets is the underlined portion.</p>
<p>Q. 11: The Pony Express was an ingenious system for carrying (mail; it was in existence only briefly, however,) before the telegraph system made it obsolete.
A) same as the underlined portion.
B) mail, for it was in existence only briefly, however,
C) mail; however, existing only briefly
D) mail, having existed only briefly
E) mail, but was existing only briefly</p>
<p>I thought the answer should have been D. It is precise and correct. The participle phrase beginning with having correctly modifies The Pony Express and is aptly preceded by a comma. For instance, if the participle phrase is brought at the beginning of the sentence, there will be no grammatical error in this sentence.</p>
<p>The correct answer, however, is A. Although the choice is grammatically correct, I thought it is more verbose than D.</p>
<p>Q. 19: After the prince characterized modern architecture (as ugly), he (has been) (severely) criticized for having been (so outspoken) in public. (No Error)</p>
<p>Now the actual error occurs at has been. (According to CB)
The explanation: The use of after with the past tense characterized in the introductory clause requires the use of past and not present perfect tense in the main clause. Therefore, has been: should be changed to was. Duh??</p>
<p>I have never come across this grammatical rule. I thought that has been makes a perfect sense because the criticism might continue up to this day. Please clarify.</p>
<p>Q 27: I have gone (to) (only one) foot ball game (after) I (graduated) from high school. (No Error.)</p>
<p>The error occurs at after. (According to CB) It should be replaced by since, which is more idiomatic.</p>
<p>But I thought that error occurred at graduated because have graduated makes more sense. Even if after is replace by since, have graduated will make more sense. The reason: First, have graduated will become parallel with have gone. Second, the graduation continues up to this day- as in, he has graduated in the past and continues to be graduated to this day; thus, present perfect tense should have been used. I really found this question tricky. Please help!</p>
<p>Section 10:
Q 1: (A recent discovery is the finding that) people who both drink and smoke have greater cancer risks than those who do only one of these things.
A) Same. ; B) and C) do not make sense in any case.
D) It has recently been discovered that
E) It is a resent discovery that.
The correct answer is D. Now I understand that D sounds perfectly grammatical. But I thought that D was passive. So E made a better answer since the latter it is lesser wordy, grammatically correct and active. Clarify please.
Thanks in advance.</p>