難度：★ 考點：情態動詞的用法
1.You________stop when the traffic light turns red.
A.can B.had better C.need D.must
2.When winter comes,days get______.
A.long and long B.short and short C.longer and longer D.shorter and shorter
3.-Mum,must I stay there the whole day?
-No,you____________.You____________come back after lunch,if you like.
A.mustn't;can B.needn't;must C.needn't;may
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