one of them tries to work out the problems hard改为疑问句

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one of them tries to work out the problems hard改为疑问句
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one of them tries to work out the problems hard改为疑问句
one of them tries to work out the problems hard改为疑问句

one of them tries to work out the problems hard改为疑问句
特殊疑问句:Who tries to work out the problems hard?
How does one of them tries to work out the problems
What does one of them tries to work out hard?
一般疑问句:Does one of them try to work out the problems hard?