helen is singing in the next room .-It--be helen.she has gone to Beijing.a can not b must not c may
人气：436 ℃ 时间：2019-08-18 23:28:53
解答
答案不是B,你找一个英语老师问问,就知道我说的对.
选A
can not 不可能
must not禁止（只有这一种意思,无不可能之意）
may not也许不
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