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

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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
单项选择题
A professor of economic and history at Atlanta University, W.E.B. Du Bois, promoted full racial equality（）.

A．economy
B．economics
C．economical
D．economic
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