will they _study at home A：has to B：have to C：must D：can 老师说

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will they _study at home A：has to B：have to C：must D：can 老师说答案是B,但我认为D也行,为什么是B

D不可以的
will是一个助动词,后面要加实意动词的,怎么能加情态动词呢?
按照你的说法,那Cmust也是情态动词,那也是可以的了.
will can 是不能同时用的.它们后面都是接实意动词.
B have to是不得不 have是实意动词
再问： will不是情态动词吗
再答： will助动词，也可以看成情态动词
can may must是情态动词
再问：助动词后不能跟情态动词吗

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