must表示猜测,想象 不能用否定形式
这里只能用can't be
He __upstairs because I saw him playing football on the playground just now
He __upstairs because I saw him playing football on the playground just now
A mustn't be B can't be 这里为什么不选A 这2各有什么区别
A mustn't be B can't be 这里为什么不选A 这2各有什么区别
英语人气：909 ℃时间：2019-10-10 03:16:18
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