Only when Lily walked into the office______that she had left the contract at home.

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问题 Only when Lily walked into the office______that she had left the contract at home.

选项 A、she realized
B、has she realized
C、she has realized
D、did she realize

答案D

解析 only所修饰的状语位于句首时，主句应用部分倒装，即将主句谓语中的助动词、系动词或情态动词提到主句的主语之前；倒装时若主句谓语中无助动词、系动词和情态动词，则在主句的主语前加do，does或did。此处realize的动作发生在过去，用一般过去时，故选D。

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中学英语

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