B1 情态动词和虚拟语气
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①(2012·天津卷)It's quite warm here; we ________turn the heating on yet.
A．couldn't B．mustn't C．needn't D．wouldn't
答案 C [句意：这里很暖和；我们还不需要开暖气。考查情态动词用法。根据warm及句意可知C项正确。couldn't不能；mustn't禁止；wouldn't将不。]
②(2012·上海卷)The new law states that people ________drive after drinking alcohol.
A．wouldn't B．needn't C．won't D．mustn't
答案 D [句意：新颁布的法律禁止人们酒后驾车。考查情态动词的用法。由题干中的law可知答案为D项。]
③(2011·全国Ⅱ卷)If you ________smoke, please go outside.
A．can B．should C．must D．may
