【題目】Only then _______________ that I had made a terrible mistake.

A. I realized B. did I realize

C. I had realized D. had I realized

【答案】B

【解析】考查部分倒裝。only加狀語(yǔ)位于句子開(kāi)頭，句子用部分倒裝。根據(jù)then可知主句用一般過(guò)去時(shí)態(tài)，故選B。

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