题文
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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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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