问题
选择题
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
答案
答案：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。
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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
答案：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。