He didn’t come yesterday. He ______ busy working in the lab.A、must beB、would ha

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问题 He didn’t come yesterday. He ______ busy working in the lab.

选项 A、must be
B、would have been
C、must have been
D、would be

答案 C

解析本句的时间状语是“昨天”，意思是“他昨天没来，一定是忙着在实验室工作。”would have done表示与过去事实相反的假设的虚拟语气，而must have done表示过去的肯定推测。因此选C。

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