I have __________ th

I have __________ th
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
冰冷的草鞋 1年前 已收到1个回答 举报
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neta 幼苗

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C

1年前

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