You ____ clean the room now.You ___ do it after supper.A.won't,must. B.don't have to,may. C.needn't,must. D.shouldn't,can为什么选B,其他三个为什么不可以?原因,谢谢!

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You____cleantheroomnow.You___doitaftersupper.A.won''t,must.B.don''thaveto,may.C.needn''t,must.D.shouldn

You ____ clean the room now.You ___ do it after supper.A.won't,must. B.don't have to,may. C.needn't,must. D.shouldn't,can为什么选B,其他三个为什么不可以?原因,谢谢!
You ____ clean the room now.You ___ do it after supper.
A.won't,must. B.don't have to,may. C.needn't,must. D.shouldn't,can
为什么选B,其他三个为什么不可以?原因,谢谢!

You ____ clean the room now.You ___ do it after supper.A.won't,must. B.don't have to,may. C.needn't,must. D.shouldn't,can为什么选B,其他三个为什么不可以?原因,谢谢!
选A的话是一般将来时,与后面的now冲突,need后面直接加动词是作情态动词的用法,应用于否定句,should是shall的过去式,用于过去时态