【单选题】
The research scientists often meet with problems_____new types of instrument for their solution.
A.requiring
B.required
C.to require
D.being required
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根据网考网移动考试中心的统计,该试题:
65%的考友选择了A选项
6%的考友选择了B选项
16%的考友选择了C选项
13%的考友选择了D选项