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
B.After
C.Till
D.Until

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

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