题目内容
--- 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
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题目内容
--- 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