I have __________ the problem for two hours, but I haven't __________.[ ]A. worked on, worked out itB. worked at, worked it outC. worked on, worked it out-初中英语-魔方格

◎ 题干

I have __________ the problem for two hours, but I haven't __________.

[ ]

A. worked on, worked out it
B. worked at, worked it out
C. worked on, worked it out

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◎ 解析

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◎ 知识点

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◎ 相似题

与“I have __________ the problem for two hours, but I haven't __________.[ ]A. worked on, worked out itB. worked at, worked it outC. worked on, worked it out”考查相似的试题有：

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