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【单选题】

Suddenly he heard someone ______ gently on the window.
A.knock

B.knocking
C.knocked
D.to knock
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根据网考网移动考试中心的统计,该试题:

10%的考友选择了A选项

89%的考友选择了B选项

0%的考友选择了C选项

1%的考友选择了D选项

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