Not until the meeting was over ______ that he had made a mistake in his speech.A

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问题 Not until the meeting was over ______ that he had made a mistake in his speech.

选项 A he realized
B did he realize
C he has realized
D has he realized

答案B

解析直到会议结束他才意识到他在讲话中犯了一个错误。
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