【单选题】
The manager of the company firmly believed that one of the important ______ sources of new customers was the children's market.
A.unfolded
B.unknown
C.unsolved
D.untapped
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根据网考网移动考试中心的统计,该试题:
13%的考友选择了A选项
11%的考友选择了B选项
21%的考友选择了C选项
55%的考友选择了D选项