单项选择题

It was not until then that I came to know knowledge （）only from practice.

A. had come
B. has come
C. came
D. comes

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单项选择题

Without electricity human life （） quite different today.

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

单项选择题

I applied for the job that I saw advertised（）the paper.

A. on
B. of
C. in
D. at

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