<p>A noted cynic opined that lwas are spider webs [through which big flies pass and little ones get caught].</p>
<p>B) by which big flies pass and little ones get caught
C) through which big flies pass and in which little ones get caught
D) through which big flies pass but little ones get caught
E) through which big flies pass and little ones get caught in</p>
<p>The correct answer is C. What I don't understand is why C is a better choice than D. </p>
<p>Thanks in advance. </p>
<p>Don’t know the technical term for this, but with D you’re saying that the “through which” applies to both phrases (“through which big flies pass but through which little ones get caught”). In C, they switch the preposition from “through” for the first phrase to “in” for the second phrase.</p>
<p>I don’t technically know what this grammatical rule is called, but does my explanation make sense?</p>
<p>Oh right I think it would be considered a parallelism issue then, but I understand your explanation.
Thanks</p>
<p>Don’t end that sentence with a preposition (“in”). </p>
<p>(the SAT doesn’t treat sentence-terminal prepositions as wrong, fyi)</p>