Question

【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

Answer 1

【答案】D

【解析】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。