单项选择题

They () on the program for almost one week before I joined them.

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

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单项选择题
The coat is worth().

A.buying
B.having bought
C.being bought
D.to be bought
单项选择题
I () the Summer Palace before, but I decided to visit it a second time.

A.have visited
B.visited
C.hadn't visited
D.had visited
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