Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.
题型：不详难度：来源：
Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.| A．mustn’t | B．ought not to | C．needn’t | D．don’t have to |
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答案
| A |
解析
试题分析：mustn’t禁止，一定不；ought not to不应该；needn’t不必；don’t have to不必；句意：看这个标志，上面写着“禁止吸烟”。你不能在这儿吸烟。太危险了。结合语境可知选A。 |
举一反三
— Dad, must we wait until the light becomes green?
— Yes, I’m afraid we ______. That’s the traffic rule.| A．can | B．may | C．have to | D．need |
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—Tom can’t find his gloves. Are these blue gloves his?
—No, they ______ be his. His gloves are black.
| A．must | B．may | C．can’t | D．mustn"t |
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— Must we send our plan this week?
— No, you ______.| A．mustn’t | B．can’t | C．shouldn’t | D．needn’t |
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— ______ you sing the English song?
— Yes, I can. But only a little. |
You _______ cross the road when the traffic lights are red.| A．can | B．must | C．mustn’t | D．needn’t |
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