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一道英语题:_____you are not well,you needn't go with me.

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一道英语题:_____you are not well,you needn't go with me.
______you are not well,you needn't go with me.
A.For B.Since C.As D.If
正确答案是B,意思是既然,为什么D不行呢?表示如果啊?
实义动词的need和情态动词的need有什么区别吗?为什么用if,就应该用shouldn't?我觉得用need也可以啊!
如果用D if 的话,更地道的说法是,If you are not well,you don't need to go with me.
Needn't 在这里可以理解成,不必,已经有否定的意思在里面了.