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He didn’t come yesterday. He ______ busy working in the lab.A、must beB、would ha
He didn’t come yesterday. He ______ busy working in the lab.A、must beB、would ha
游客
2025-03-15
10
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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