Question

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

[　　]

A．

didn’t I realize

B．

did I realize

C．

I didn’t realize

D．

I realized

Answer 1

答案：B
提示：

not until连接的句子位于句首，not until从句的谓语动词不倒装，主句谓语动词实行半倒装。