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【单选题】

thEy ______ us sinCE FivE o'CloCk this morning until now.
A．ArE hElping
B．hElp
C．hAvE hElpED
D．hAvE BEEn hElping

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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

0%的考友选择了B选项

6%的考友选择了C选项

89%的考友选择了D选项

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