Never before ______ such a smoke in the room.

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问题 Never before ______ such a smoke in the room.

选项 A、have I read
B、did I read
C、do I read.
D、am I reading

答案A

解析 以前我从来没看见房间里有烟。否定词在句首,助动词提前,而且never一般与现在完成时连用。故答案为A。
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