We________ on it for several hours, but we have not yet found any satisfactory solution.( )_ -题库考试答案搜索网

We________ on it for several hours, but we have not yet found any satisfactory solution.( )_

单选题

2021-07-17 23:06

A、 are working
B、have been working
C、 have been worked
D、work

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正确答案

B

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