Nobody saw the CEO at the seminar; he ______ at it

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问题 Nobody saw the CEO at the seminar; he ______ at it

选项 A、couldn’t have spoken
B、couldn’t speak
C、mustn’t have spoken
D、shouldn’t have spoken

答案A

解析 couldn’t do sth,不可能做某事(很有把握的猜测),由于句中表示的是对过去情况的猜测,所以用couldn’t have done结构,选A。
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