Sentence ID Question

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1

<p>hey guys i have another grammar question... sorry i should've posted it in the same thread as before...</p>

<p>but here it is:</p>

<p>Members of the vice-presidential family (A are permitted) to choose paintings from the National Gallery of Art (B to display) in the Victorian mansion that (C serves as) (D their) official residence. (E)</p>

<p>Why is the answer E? Isn't it C because serves should be serve?</p>

<p>And i have one more Sentence ID question:</p>

<p>Perhaps as (A a consequence of) warfare (B that erupted) when natural resources became scarce, many of easter island's large stone statue, called Moai, (C have been toppled) by the islanders ( D themselves) three centuries ago. (E)</p>

<p>why is the answer C? should it be "were toppled" instead of "have been toppled" and if so why?</p>

<p>Thanks
!</p>

2

<p>mansion is singular, so no, should not be “serve”</p>

<p>There was a lot of debate on this one after the test, but yes, I think there’s a tense inconsistency with “have been toppled”</p>