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15.---Shall we have a smoke here?
---No,we  .Because the worker is carrying some petrol.(  )
A.won'tB.mustn'tC.don't have toD.needn't

分析 --我们在这抽支烟好吗?
--不,我们绝对不能那么做.因为这个工人正在搬运汽油.

解答 答案:B.根据Because the worker is carrying some petrol可知这个工人正在搬运汽油,所以吸烟是绝对禁止的,因此答案是B,用mustn't表示"禁止,绝对不能".其他选项中A表示"不会";C和D表示"不必".

点评 考查情态动词.must的用法
(1)(表义务、必要性、命令)必须,得,要
"Must I wash the dishes at once?""No,you needn't.""我得立刻洗这些盘子吗?""不,不必."
【注】mustn't表"禁止、不准".
You mustn't play with the knife;you may hurt yourself.你不可玩刀子,你会把自己割伤的.
(2)(表必然性)必定
Everyone must die.每个人都必定会死.
(3)(表固执、不满等)偏偏;硬要;偏要
If you must know,I'm going to help him look for an apartment.如果你偏要知道,那我告诉你,我要去帮助他找一套公寓.

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