2. 外语
  3. He didn’t come yesterday. He ______ busy working in the lab.

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

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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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