【单选题】
When you"re reading a document, underlining may help to keep your mind
______on the material.
A.
focus
B.
focused
C.
to focus
D.
having focused
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根据网考网移动考试中心的统计,该试题:
18%的考友选择了A选项
66%的考友选择了B选项
3%的考友选择了C选项
13%的考友选择了D选项