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

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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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