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    【题目】 Only when Lily walked into the office ______ that she had left the contract at home.

    A. she realized B. has she realized

    C. she has realized D. did she realize

    【答案】D

    【解析】试题分析：句意：只有当莉莉走进办公室的时候，她才意识到她把合同忘家里了。本题考查only位于句首，引导的时间状语从句，主句要主谓倒装。根据时态和句意可知选D。本题考查only放在句首的部分倒装。在句首的only如果后面跟了副词、介词短语或从句等状语,则主句用倒装结构。但如果only后跟的是主语,就不用倒装结构了。本题考生还需要注意判定时态，答案就不难选出。

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