题目内容
Are they doing____ homework?
- A.them
- B.theirs
- C.they
- D.their
D
本题主要考查代词的用法，them是人称代词宾格；theirs是名词性物主代词；they主格；their形容词性物主代词，根据题意故选D。
本题主要考查代词的用法，them是人称代词宾格；theirs是名词性物主代词；they主格；their形容词性物主代词，根据题意故选D。
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