【题目】Only yesterday ______ what was going on.
A．did I realize B．had I realized
C．I realized D．I did realize
在线课程【答案】A
【解析】句意：直到昨天我才意识到发生了什么事。only置于句首强调时间状语yesterday，主句要进行部分倒装，句型为：only+状语/状语从句+be/助动词/情态动词+主语，本句有时间状语yesterday，故时态应该用一般过去时。
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