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【题目】– Tom, it's too late. Our son ________ be back.
– Don't be anxious. I dare say he ________ have some extra work to do.
A.must,must
B.should ,should
C.should ,must
D.must ,should

【答案】C
【解析】考查情态动词。should "按理说,应该” must “肯定”。句意:---Tom,太晚了,我们儿子应该回来了。---别担心。我敢说他一定有些额外的工作要做。

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