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问题: 英语选择,请帮忙分析!非常感谢!

The room_____ as a meeting room.
A.used to being used
B.was used to being used
C.used to be used
D.was used to be used

解答:

used to do sth 固定搭配,used to后加动词原形,表示曾经做过某事
be used as 也是固定搭配,被当作..使用
The room__used to be used _ as a meeting room.

这房间曾经是(被当作)会议室。