Only when he had done it ______ that he had made a mistake.
A．he then realizedB．did he realizeC．beforeD．he realized
B
考查倒裝，only + 狀語(yǔ)開(kāi)頭句子采用倒裝。 句意：只有當(dāng)他做了那件事后他才意識(shí)到他犯錯(cuò)誤了。
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