BE TO DO表示将要
这里的IS TO BE就是BE TO DO 的用法
只不过这里的BE充当DO的用法
She is to be here by ten o'clock.这里用be干什么?
She is to be here by ten o'clock.这里用be干什么?
英语人气：852 ℃时间：2020-02-01 08:06:40
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