组卷网 > 初中英语综合库 > 短语辨析 > K > keep doing sth.
题型:单项选择 难度:0.65 引用次数:101 题号:13663876
It was difficult for them to keep ________ for hours and they were ________ out.
A.to run; tiringB.to run; tiredC.running; tiredD.running; tiring

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