It was not until I reached my apartment building and unlocked the door what the noise had been.A. th

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【题目】It was not until I reached my apartment building and unlocked the door __________ what the noise had been.

A. that did I realize B. before I realized

C. that I realized D. did I realize

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【答案】C

【解析】句意:直到到达了公寓楼并开开门，我才意识到噪音是什么。