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  3. ______the numbers of such developments are relatively small, the potential market is large.

______the numbers of such developments are relatively small, the potential market is large.

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问题 ______the numbers of such developments are relatively small, the potential market is large.
选项 A、When
B、While
C、Since
D、As
答案B
解析 根据句中的relatively small和large可知，前后两句之间表示对比。when：当……时候；while：虽然，在……期间；since：自从；as：作为，由于。故选B。
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