【題目】– 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】考查情態(tài)動詞。should "按理說，應該” must “肯定”。句意：---Tom，太晚了，我們兒子應該回來了。---別擔心。我敢說他一定有些額外的工作要做。

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