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單項(xiàng)選擇題

Once he starts a job, he won't stop（）it is finished.

A.till
B.after
C.before
D.until

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單項(xiàng)選擇題

（）you told me, I had heard nothing of what happened.

A.Not
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單項(xiàng)選擇題

The president claimed the terrorists should be held responsible（）the explosions that happened last month in London.

A.for
B.on
C.at
D.about