I wonder who drank all the milk yesterday. It ______ have been Peter because he

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问题 I wonder who drank all the milk yesterday. It ______ have been Peter because he was out all day.

选项 A、mustn’t
B、can’t
C、won’t
D、needn’t

答案 B

解析 can’t是表示肯定推测的must的否定形式，表示“不可能，不会是”。

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[originaltext]M:Excuseme,madam.W:Yes?M:Iwonderwhetheryou’dhelpus.W