请帮我做一下以下题目，特急！！！
50.BeforeIgottothecinema,thefilm_________.A.hadbegunB.hasbegunC.isbegunC.wasbeginning...
50. Before I got to the cinema, the film _________.
A. had begun B. has begun C. is begun C. was beginning
51. I have lived here ____ for ___ 1997.
A. for B. since C. from
52. A lecture hall is _________ where students attend lectures.
A. that B. one C. which
53. When I was a child, we ________ wear a uniform for school.
A have to B must C had to
54. I’m tired. I ________ working very hard.
A. have B. have been C. had
55. He keeps _________ at himself in the mirror.
A. to look B. looking C. look 展开
A. had begun B. has begun C. is begun C. was beginning
51. I have lived here ____ for ___ 1997.
A. for B. since C. from
52. A lecture hall is _________ where students attend lectures.
A. that B. one C. which
53. When I was a child, we ________ wear a uniform for school.
A have to B must C had to
54. I’m tired. I ________ working very hard.
A. have B. have been C. had
55. He keeps _________ at himself in the mirror.
A. to look B. looking C. look 展开
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