题目内容
【题目】Only when he returned home ______ what had happened.
A. did he realize
B. he realized
C. he did realize
D. has he realized
【答案】A
【解析】Only强调状语放在句首，引起部分倒装，和现在无关，所以用一般过去时。
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题目内容
【题目】Only when he returned home ______ what had happened.
A. did he realize
B. he realized
C. he did realize
D. has he realized
【答案】A
【解析】Only强调状语放在句首，引起部分倒装，和现在无关，所以用一般过去时。