单项选择题

Professor White, my respected tutor, frequently reminds me to______myself of every chance to improve my English.

A．assure
B．inform
C．avail
D．notify
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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
单项选择题
We were working （） time to get everything ready for the exhibition.

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