单项选择题

How much did you（）fixing the TV

A．pay off
B．pay back
C．pay for
D．pay down

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单项选择题

Many people believe we are heading for an environmental disaster(灾难) （）we radically(根本地) change the way we live.

A．but
B．though
C．unless
D．in case

单项选择题

It's good that we （）to the park because it's started to rain.

A．don' t go
B．hadn' t gone
C．didn' t go
D．wasn' t going

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