单项选择题

I will have begun to do the work ______ 5 o’clock this afternoon.

A. by
B. at
C. after
D. before
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单项选择题
______ different life today is ______ what it was 15 years ago.
A. How; from

B. What a; from
C. What; from

D. How; with
单项选择题
A. I’m not in the office. B. No, I am. C. I have homework to do. D. I’m a student.
A. I’m not in the office. B. No, I am.
C. I have homework to do. D. I’m a student.
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