Tom must have practiced swimming with his father last Sunday, ______ he?

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问题 Tom must have practiced swimming with his father last Sunday, ______ he?

选项 A、didn’t
B、hasn’t
C、wasn’t
D、mustn’t

答案A

解析 must表推测时,反义疑问句在形式上应与must后面的动词保持一致。因此本句的反义疑问句可以有两种形式hasn’t..或didn’t...。因陈述句部分的时间状语为过去时间点,所以其反问部分应用didn’t he。
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