单选题Only when he arrived&nbsp

问题补充：

单选题Onlywhenhearrivedhome_____thathehadlefthiskeyintheoffice.A.will he realizeB.he did realizeC.did he realizeD.should he realize

答案：

C解析only+状语主句采用部分倒装，本题叙述的是过去的事情所以应该用一般过去时态