单项选择题

A soldier has to learn to carry ______orders as soon as they are given.

A．on
B．out
C．through
D．off
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单项选择题
We should do everything in our power to develop ______alternatives to petrol.
A．audible
B．capable
C．liable
D．viable
单项选择题
I didn't ______the meeting because I was ill.
A．join
B．enter
C．attend
D．appear
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