______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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