单项选择题

Although the social sciences different a great deal from one another, they share a common interest in human relationship（）.

A．move
B．differ
C．change
D．varies

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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
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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