No sooner ______ stepped out of the hall than it began to rain.

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问题 No sooner ______ stepped out of the hall than it began to rain.
倒装结构

选项 A、had we
B、have we
C、did we
D、do we

答案A

解析 当表示否定意义的词“never, hardly, seldom, under no conditions, no sooner”等置于句首时要用部分倒装结构,即将谓语动词的助动词置于主语之前。以no sooner...thart/ hardly...when引起的从句中谓语若用一般过去时,主句谓语动词就用过去完成时,故选A。
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