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__ It is so late. Our son __________ be back .
__ Don’t  worry . I dare say he ________ have some extra work to do.
A.can ; mustB.will ; mightC.should ; mustD.must ; may
B
考查情态动词。Will在这里表示推测,可能,想必,might have done,表示对过去可能性的推测。句意:如此的晚了,我们儿子这时候会回来的。别担心,我敢说他可能有一些额外的工作要做。所以选B。
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