单项选择题

Having finished lunch, the case was discussed（）.

A．they discussed the case
B．they had discussed the case
C．the case was discussed
D．the case had been discussed

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单项选择题

During many sectors are foundering, the $21 billion videogame-software industry is booming, adding game developers at a rate of 2,500 a year in the United States alone（）.

A．When
B．Whereas
C．Would
D．While

单项选择题

When I last saw them, the police had chased the robbers down Columbus Street（）.

A．were chasing
B．was chasing
C．chased
D．were on a chase

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