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do you agree that a solider _____ think?a.don't have b.don't

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do you agree that a solider _____ think?a.don't have b.don't has to c.needn't d.needn't to
搞不清是c 还是 d 请详解 need 用法,
答案是C
B改为: doesn't have to=needn't就对了
needn't直接加not是情态动词,后面不接to了
need做情态动词一般用于疑问、否定句的.
He needn't come.情态动词
need接to或宾语就是行为动词,其否定式为don't/doesn't need
I need you.行为动词.