He isn't in the school .I think he __be ill.
A.can B.must为什么?
人气：168 ℃ 时间：2020-01-30 18:08:43
解答
must be 表肯定推测“可能是...”
can't be 表否定推测“不可能是...”
这时就不能用mustn't be
若用can则表示为“能够”等意
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