单项选择题

I first met Lisa three years ago when we（）at a radio station together.

A. have worked
B. had been working
C. were working
D. had worked

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All the students（）John went to the park on Sunday. He was ill.

A. besides
B. except
C. with
D. without
单项选择题
--are you trying to prove to police--Where I was last night.（）

A. What
B. Why
C. How
D. When
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