21.Not until I began to work __________how much time I had wasted.A.didn21.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这里为什么要选B 不选A?
问题描述：
21.Not until I began to work __________how much time I had wasted.A.didn
21.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
这里为什么要选B 不选A?
答
倒装句
not 已经在句首了，所以did不需要再否定了，选B。
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答
选A就是双重否定了变肯定了。
答
这是一个定式,你只要死记就行.前面的not 是一个倒装,这句话也可以这样：I did not realize how much time I had wasted until I began to work.把Not 放在最前面,加重了语气