Explain these writing questions for me

Test Preparation SAT Preparation
1

<ol>
<li>Twice as many bird species inhabit Ecuador (as in) North America.</li>
</ol>

<p>A. as in
B. as inhabit
C. instead of in
D. when compared to
E. than</p>

<p>The answer is B, but that seems completely wrong and awkward. "Twice as many bird species inhabit Ecuador as inhabit North America"? I understand parallel structure, but isn't that redundant? Why is the answer right?</p>

<ol>
<li>Both her work on community service projects and her dedication to learning (has gained) Ms. Stevens the respect of the entire faculty.</li>
</ol>

<p>The error is in parentheses. I don't see anything wrong with it.</p>

2

<p>23) the verb “has” is singular, whereas the subject is plural (her work and her dedication). Has gained should be changed to “have” gained.</p>

3

<p>Number 1 has to be A or B because the comparison involving “as many” has to conclude with “as,” and not with “instead of,” “when compared to” or “than.”</p>

<p>It can’t be “as in” because of the parallelism issue you mentioned.</p>

<p>It’s not wrong to say “Twice as many bird species inhabit Ecuador as inhabit North America,” but it is more common to omit that second “inhabit.”</p>