(单选题)
Only when I reached the top of the mountain ______ that it is impossible to get down before sunset.
A.I realized
B.I did realize
C.realized I
D.did I realize
参考答案:D
参考解析:
考查only+状语位于句首的倒装。句意:只有当我到达山顶时,我才意识到在日落前下山是不可能的。Only修饰状语置于句首,主句需要采用部分倒装,即助动词/情态动词/be动词+主语+动词。故选D。
知识点:
