题目内容
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 |
B
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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