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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单项选择题
Modem man is careless when disposing () his garbage.

A. of
B. to
C. at
D. about
单项选择题
______, I picked up the phone and rang my sister in AustraliA．
A． Off impulse
B． On guard
C． Off guard
D． On impulse
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