They busy doing their homework． [ ] A． is B． am C． are D． / 题目和参考答案——青夏教育精英家教网—

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They ________ busy doing their homework．
[　　]
A．	is
B．	am
C．	are
D．	/

答案：C
解析：

　　考查系动词。主语they是复数形式，系动词应用are。故选C项。

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