问题标题：
3、-Mustweleavenow?-No,we___.weleavenow?-No,we___.westillhavetwomorehours.a.can‘t.b.mustn't.c.needn't.d.shouldn't4.Tom___comewithustogether,butheisnotverysureyet.A.must.b.may.c.can.d.should5、yourfriend___moreifhewa
问题描述：
3、-Mustweleavenow?-No,we___.weleavenow?-No,we___.westillhavetwomorehours.
a.can‘t.b.mustn't.c.needn't.d.shouldn't4.Tom___comewithustogether,butheisnotverysureyet.A.must.b.may.c.can.d.should5、yourfriend___moreifhewantstobethinner.a.needsexerciseb.needsexercisingc.needexercisingd.needstoexercise
何开锋回答：
3.选C,由must提问,如果是否定回答的话,就用needn't,没必要；如果是用Need提问,后作肯定回答的话,用must.4.选B,在这几个情态动词中,must的语气最强烈,may的语气最弱,should表示应该,can表示能力或者可能.这里后半句...
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