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【题目】— Is Helen knocking at the door ?

— No. It be Helen. She is in America now.

A. doesn’t B. must C. hasn’t D. can’t

【答案】D

【解析】试题分析:——是海伦正在敲门吗?——不。不可能是海伦。她现在在美国。

Can’t可表示说话人的猜测。故选D。

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