单项选择题

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

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单项选择题
I liked to play football when I was young.（）

A. So he was
B. So was he
C. So did he
D. So he did
单项选择题
Without electricity, human life （）quite different today.

A. is
B. will be
C. would have been
D. would be
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