No sooner ______ than I realized I’d left the document at home.

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问题 No sooner ______ than I realized I’d left the document at home.

选项 A、have we sat down
B、had we sat down
C、we had sat down
D、we sat down

答案B

解析 本题考查no sooner…than句型。在这个句型中,no sooner其后为主句部分,动词要用过去完成时,而且主谓语要进行倒装,than后为从句部分,动词用一般过去时,根据此规则本题应选B。
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