单选题
It was not until the accident happened ______.
A) that I realized my carelessness
B) when I realized my carelessness
C) as I realized my carelessness
D) when my carelessness has been realized
A
B
C
D
【正确答案】
A
【答案解析】
[解析] 由“It is/was+被强调部分+that/who... ”构成强调结构，被强调的部分可以是句子的主语、宾语或状语。再如：It is my father who gave me the power to live，(是父亲给了我生存下去的力量。)
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