问题描述：
-Mum,may I watch TV after supper?- No.You _ finish your homework first.
A.needn ’ t
B.mustn ’ t
C.shouldn't
D.don't have to
为什么选C
No.,you _.you must finish your homework first
A.needn ’ t
B.mustn ’ t
C.shouldn't
D.don't have to
为什么选C
No.,you _.you must finish your homework first
问题解答：
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