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needn't与don't need

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needn't与don't need
You ____ a bus.The bookshop is near here.
A.need B.not need C.need not D.don't need
为什么选D,不选C?
needn't与don't need
原因：
1.need 可以用作实义动词,意思是“需要”,这时其后是宾语,其否定句与一般动词没什么区别.
2.need 也可以用作情态动词,意思也是“需要”,但这时其后是动词,就像can,must一样其否定形式是直接在need后加not.
3.本句后是名词,说明need在句中是实义动词.所以尽管是否定句,其否定词也不能直接加在need上.
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