【題目】 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】試題分析：句意：只有當(dāng)莉莉走進(jìn)辦公室的時(shí)候，她才意識(shí)到她把合同忘家里了。本題考查only位于句首，引導(dǎo)的時(shí)間狀語從句，主句要主謂倒裝。根據(jù)時(shí)態(tài)和句意可知選D。本題考查only放在句首的部分倒裝。在句首的only如果后面跟了副詞、介詞短語或從句等狀語,則主句用倒裝結(jié)構(gòu)。但如果only后跟的是主語,就不用倒裝結(jié)構(gòu)了。本題考生還需要注意判定時(shí)態(tài)，答案就不難選出。

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