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單項(xiàng)選擇題

The police knew the （） of the accident.

A.cause
B.reason
C.result

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單項(xiàng)選擇題

The pilot turned engine （） and is ready to take off.

A.up
B.off
C.on

單項(xiàng)選擇題

Progress has been （） in aeroplane design.

A.done
B.made
C.produced

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