單項(xiàng)選擇題Before she left on the trip, she()hard.

A.had trained;
B.has trained
C.would trained


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1.單項(xiàng)選擇題A lecture hall is()where students attend lectures.

A.that
B.one;
C.which

2.單項(xiàng)選擇題I have lived here()1997.

A.for
B.since 
C.from

3.單項(xiàng)選擇題Before I got to the cinema, the film()

A.had begun
B.has begun
C.is begun

4.單項(xiàng)選擇題You()to lock the door at night.

A.shall
B.ought
C.must

5.單項(xiàng)選擇題Silk()by Chinese for thousands of years now.

A.has been used
B.was used
C.is used