He ________ have been nervous because he didn’t go straight in.A、ought toB、must

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问题 He ________ have been nervous because he didn’t go straight in.

选项 A、ought to
B、must
C、should
D、had to

答案 B

解析 “must+完成时(或完成进行时)”可用来表示对过去的事实一种较为确定的推测，表示过去某时刻必定发生的事。而ought to，should和had to分别含有应该和不得不的语气，不符合题意。因此B为正确选项。

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He________havebeennervousbecausehedidn’tgostraightin.A、oughttoB、must