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【单选题】

He didn't come yesterday. He ______ busy working in the lab.
A．must be

B．would have been
C．must have been
D．would be
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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

5%的考友选择了B选项

58%的考友选择了C选项

37%的考友选择了D选项

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