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Ioftenheardher       intheroom.A.sing   B.sang   C.sing...

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问题详情:

Ioftenheardher       intheroom.A.sing   B.sang   C.sing...

I often heard her        in the room.

A. sing    B. sang    C. singing       D. sings

【回答】

A    

知识点:动词和动词短语

题型:选择题