【题目】Only when lily walked into the office ________that she had left the contract at home.
A. that she realized B. has the realized
C. that she has realized D. did she realize
在线课程【答案】D
【解析】考查倒装句。句意：只有当lily走进办公室时她才意识到把合同忘在家里了。副词Only作状语放在句首句子部分倒装，助动词did提到主语 she之前，故选D.