【題目】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強(qiáng)調(diào)狀語放在句首，引起部分倒裝，和現(xiàn)在無關(guān)，所以用一般過去時(shí)。

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