题目

No sooner _____ themselves in their seats in the theatre _______ the curtain went up.        A．they have settled; before  B．had they settled; than        C．have they settled; when   D．they had settled;than 答案：B 解析: no sooner…than…,hardly…when…结构中，主句应用过去完成时的倒装结构。故选B。

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