Question

【题目】Not until they were introduced to each other ______ they had met at a dinner party.

A.they realizedB.had they realized

C.they had realizedD.did they realize

Answer 1

【答案】D

【解析】

考查倒装。句意：直到他们互相介绍认识之后，他们才意识到他们是在一次宴会上认识的。not until结构放在句首时, 其后的主句用部分倒装结构。此空“意识到”的时间发生在“被互相介绍”之后, 根据were introduced可知此空应用一般过去时。故选D。