There is nobody here in the office-they

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问题 There is nobody here in the office-they ____ have all gone home.(  )A. must B. can C. would D. should

选项 A. must
B. can
C. would
D. should

答案 A

解析 句意:办公室空无一人——他们一定都已经回家了。can表示推断时常用于否定句中,故排除B;would have done常用于从句为对过去的虚拟的主句中,故排除C;should have done意为“本应该做某事(实际并未做)”,不合题意,故排除D。表示对事情的肯定推断,一般用must。故选A。
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