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He didn’t come yesterday. He______busy working in the lab.A、must beB、would have
He didn’t come yesterday. He______busy working in the lab.A、must beB、would have
游客
2025-03-13
19
管理
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表示对过去的肯定推测。因此选C。
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