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—May I smoke here?    —If you _____, choose a seat in the smoking section.
A.shouldB.couldC.mayD.must
D

试题分析:这是一组对话。上文,我可以在这里吸烟吗?下文,如果你必须吸烟的话,在吸烟区选择一个座位。Must表示必须,故选D。
点评:情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语。
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