单项选择题

John had been working hard and ()

A. so had his brother
B. so his brother had
C. so was his brother
D. so his brother did

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单项选择题
I know Bob ()but I have never actually spoken to him.

A. by sight
B. out of sight
C. in sight
D. on sight
单项选择题
() radio and TV have changed many aspects of our lives, so laser will bring about great changes in science and technology.

A. Much as
B. As far as
C. Just as
D. As for
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