单项选择题

The article gives us a summary of the situation in the first part and then discusses it （）.

A. at issue
B. at length
C. at random
D. at large

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单项选择题

We were working （） time to get everything ready for the exhibition.

A. against
B. in
C. on
D. ahead

单项选择题

Modem man is careless when disposing () his garbage.

A. of
B. to
C. at
D. about

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