—Hadwebeenmorecareful,theaccid

— Had we been more careful, the accident might not have happened.
— But we _____ at that time.

A．hadn’t

B．didn’t

C．weren’t

D．might not

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A．caused

B．has caused

C．causing

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A．point

B．idea

C．attitude

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A．unrecognized

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A．have worn

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