When his mother phoned, ___________ (这个退学的学生一定正在校园里徘徊).the dropout must have bee

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问题 When his mother phoned, ___________ (这个退学的学生一定正在校园里徘徊).

选项

答案 the dropout must have been lingering on campus

解析 ①dropout表示“退学的学生”；②must have been lingering表示“一定正在……徘徊”；“must+动词的现在完成时”表示对过去情况的猜测③on campus表示“在校园里”。

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