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_____your sister sad?

A.Are

B.Is

C.Am

D.Be

 

【答案】

B

【解析】

试题分析:考查be动词的用法:主语是your sister,be动词用is,句意是:你姐姐难过吗?选B。

考点:本题考查be动词的用法。

点评:be动词的选择一定要注意主语,主语是I时要用am,主语是复数时要用are,主语是第三人称单数时要用is。

 

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