2.I took him an hour to work out the problem .( 同义句 )

题目

2.I took him an hour to work out the problem .( 同义句 )
4.She has to finish the work by 5 o’clock .( 改为否定句 )
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答案

2.He spent an hour working out the problem.
4.She doesn't have to finish the work by 5 o’clock