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

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

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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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