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單項(xiàng)選擇題

We’d better （）economic speed （）fuel consumption.

A.take；save
B.to take；save
C.take；to save
D.to take；to save

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單項(xiàng)選擇題

This machine （）out of order very often, but now it works well.

A.is used to be
B.was used to be
C.used to be
D.was used to

單項(xiàng)選擇題

When we arrived here yesterday, their ship （）for three days.

A.has left
B.had left
C.has been away
D.had been away

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