Question

【题目】— What are those?— ________.
A.This is a book
B.That's a book
C.They're books
D.Those are books

Answer 1

【答案】C
【解析】句意：-那些是什么？-是书。根据问句中的those, 因为指示代词用人称代词it/they代替；回答时应用they。所以选C。