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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：

8%的考友选择了A选项

21%的考友选择了B选项

69%的考友选择了C选项

2%的考友选择了D选项

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