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

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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

解析考查情态动词的用法。“must+完成时(或完成进行时)”是对过去事实一种较为确定的推测．表示过去某时刻必定发生的事。ought to／should+have done表示“本应该做某事却没有做”，与句意不符。had to“不得不”，不符合题意。因此B为正确选项。

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