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單項選擇題

It's not safe（）in the street.

A.played
B.play
C.playing
D.plays

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單項選擇題

He（）himself quickly to the new condition of his work.

A.changed
B.altered
C.adjusted
D.varied

單項選擇題

I have spent a lot of time（）working on this problem.

A.at
B.–（不填）
C.on
D.with

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