Question

—May I smoke here? —If you _____, choose a seat in the smoking section. A．shoul...

—May I smoke here? —If you _____, choose a seat in the smoking section. A．should B．could C．may D．must

Answer 1

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。