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單項(xiàng)選擇題

He worked in this company （） several years.

A.in
B.since
C.for

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單項(xiàng)選擇題

The （）of employees in this company has doubled.

A.sum
B.amount
C.number

單項(xiàng)選擇題

The Europeans （）to stay ahead in aeroplane design.

A.failed
B.missed
C.lost

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