During many sectors are foundering, the $ 21 billion videogame software industry is booming, adding game developers at a rate of

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问题 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.

选项 A、When
B、Where
C、Would
D、While

答案D

解析 表示“当……的时候”,“和……同时”常用连词while表并列;因此D为答案。
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