25.―Look!Whatamistake!Why?―Sor

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25. ―Look! What a mistake! Why?
―Sorry, I _________ on it.

A．don’t concentrate	B．hadn’t concentrated
C．haven’t been concentrating	D．wasn’t concentrating

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It was quite a serious accident, _____caused by careless driving.

A．which I think was	B．I think which was
C．which I think it was	D．I think which it was

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A．after

B．before

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D．since

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—_____I talked with him yesterday morning!

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