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【单选题】

Feel free to ______the engineer for more assistance.
A.(A) call on

B.(B) call to
C.(C) call forward
D.(D) call at
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根据网考网移动考试中心的统计,该试题:

67%的考友选择了A选项

26%的考友选择了B选项

5%的考友选择了C选项

2%的考友选择了D选项

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