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【题目】— Did Cathy have problems ________ out the problems?
—Yes. I found her _________ on it for nearly half an hour.
A.work; to work
B.to work; working
C.working; working

【答案】C
【解析】句意:—凯西解决这些问题有困难吗?--—是的。我发现她做了将近半个小时。have problems(in) doing sth. 做某事有困难, find sb. doing sth.发现某人正在做或持续做某事,结合句意,答案为C。

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