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

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单项选择题
I didn't help him. I would have ()I didn't have the money.

A．or
B．but
C．otherwise
D．still
单项选择题
When the man came () after the operation he found himself back in bed.

A．on
B．in
C．over
D．round
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