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—I cannot find Tom anywhere.

He _________ have been off long. I heard him make a call just now.

（4.0分）0.0 分
A、
shouldn.t

B、
can.t

C、
mustn.t

D、
needn.t

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出自：郑州航空工业管理学院-土木工程-公共英语（3）

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