单选题
It was not until the accident happened ______.
A、
when I became aware of my foolishness
B、
when my foolishness became obvious
C、
that did I realize my foolishness
D、
that I became aware of my foolishness
【正确答案】
D
【答案解析】
本题考查强调句的用法。强调句的构成：it is (was)+被强调部分+that+句子。本句中被强调的部分是not until所引导的时间状语从句，后应用that来连接，其后的从句不用倒装。所以选D。句意为：直到事故发生了，我才意识到自己的愚蠢。
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