题目内容
（请给出正确答案）
[单选题]
They kept on ______ till they got to the foot of the hill.
A.to run
B.running
C.runing
D.run
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.to run
B.running
C.runing
D.run
如果结果不匹配，请 联系老师 获取答案
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