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單項選擇題

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

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

A.has left
B.had left
C.has been away
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The accident resulted （） the motorman’s carelessness.

A.in
B.to
C.from
D.by

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