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

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


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

A.that
B.one;
C.which

2.單項選擇題I have lived here（）1997.

A.for
B.since 
C.from

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

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

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

A.shall
B.ought
C.must

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

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