The manager of the company firmly believed that one of the important ______ sour

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问题 The manager of the company firmly believed that one of the important ______ sources of new customers was the children’s market.

选项 A、unfolded
B、unknown
C、unsolved
D、untapped

答案 D

解析形近识别四个选项均有前缀un-，但词义各不相同。A．unfolded展开的，解开的；B．unknown未知的；C．unsolved，未解答的，未解决的；D．untapped未使用的，未开发的。本句要表达的是：未开发的客户资源是儿童市场，所以答案为D。

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