题目内容
—Did Cathy have problems ________ maths?
—Yes. I found her ________ on a math problem for nearly half an hour.
A.on, to work B.with, working C.on, working D.with, to work
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题目内容
—Did Cathy have problems ________ maths?
—Yes. I found her ________ on a math problem for nearly half an hour.
A.on, to work B.with, working C.on, working D.with, to work