【題目】— 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：—?jiǎng)P西解決這些問(wèn)題有困難嗎？--—是的。我發(fā)現(xiàn)她做了將近半個(gè)小時(shí)。have problems(in) doing sth. 做某事有困難， find sb. doing sth.發(fā)現(xiàn)某人正在做或持續(xù)做某事，結(jié)合句意，答案為C。

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