问题描述：
Lf you are busy,you ___come to attend the meeting.
a/mustn't b/ needn't c/ can't d/ have to
不明白此句的语气应该用哪个词来修饰、
a/mustn't b/ needn't c/ can't d/ have to
不明白此句的语气应该用哪个词来修饰、
问题解答：
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