题目内容

Not until I began to work ________ how much time I had wasted.

[  ]

A.didn't I realize

B.did I realize

C.I didn't realize

D.I realized

答案:B
解析:

解题思路:not until引导状语从句位于句首时,主句半倒装,故排除C、D项.A项中的not应去掉,因为not已移至句首.


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