Only when he arrived home _____ that he had left his key in the office.
A．will he realizeB．he did realizeC．did he realizeD．should he realize
C
only+狀語(yǔ)主句采用部分倒裝，本題敘述的是過(guò)去的事情所以應(yīng)該用一般過(guò)去時(shí)態(tài)答案為D。
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