He didn't know how to solve this problem.(保持句意基本不变)He (空三格) this problem.

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Hedidn''tknowhowtosolvethisproblem.(保持句意基本不变)He(空三格)thisproblem.Hedidn''tknowhowtosolvethisproblem.(保持

He didn't know how to solve this problem.(保持句意基本不变)He (空三格) this problem.
He didn't know how to solve this problem.(保持句意基本不变)
He (空三格) this problem.

He didn't know how to solve this problem.(保持句意基本不变)He (空三格) this problem.
can't deal with

He didn't know how to solve this problem.(

can't work out

he was confused with this problem
他正为这个问题所困扰