Question

Only when he had done it ______ that he had made a mistake. A．he then realized B．did he rea.

Only when he had done it ______ that he had made a mistake. A．he then realized B．did he realize C．before D．he realized

Answer 1

B

考查倒装，only + 状语开头句子采用倒装。 句意：只有当他做了那件事后他才意识到他犯错误了。