<li>[To understand fully] William shakespeare’s body of work we must analyze [not only] his most famous plays such as Hamlet, [but also] his [lesser known] plays, poems, and sonnets. [No Error]</li>
</ol>
<p>It turns out that there is no error, but I’m a bit confused about choice A. Doesn’t make more sense to switch the positions of “understand” and “fully”? But then again, it’s a sentence error question so I supposed it is gramatically correct?</p>
<ol>
<li>The newspaper reporter enjoys reading the essays [of] Orwell [during] his free time for [their] clairty, conciseness, and [because they are persuasive]. [No error]</li>
</ol>
<p>At first I thought choice A was an error, however, upon further inspection of the sentence, the error is obviously in choice D. But, even though the error was in D, is it idiomatic to say "essays of Orwell" instead saying essays BY Orwell?</p>
<p>number 21 its obviously D, like thats one of the MOST stressed points in all the SAT guide books--sentence parallelism as compared to by and or which isn't agreed on by every scholar or author writer, etc.</p>
<ol>
<li><p>There is no error because "To understand fully" is technically, grammatically correct, although it is extremely formal. The key part of this sentence is the "not only" + "but also" statement that makes the sentence correct. </p></li>
<li><p>It is correct to say the essays "of" Orwell, there is nothing wrong with that at all. D is the correct answer because "their" should be changed to "its". The subject of the sentence is "essays" and because it is not a human or an animal, (or in fact a living-breathing organism), it must be referred to as "its".</p></li>
</ol>