the problem is very difficult.we can't work it out.(合并一个句)the problem is_ _ _ _to work out.

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theproblemisverydifficult.wecan''tworkitout.(合并一个句)theproblemis____toworkout.theproblemisverydifficul

the problem is very difficult.we can't work it out.(合并一个句)the problem is_ _ _ _to work out.
the problem is very difficult.we can't work it out.(合并一个句)the problem is_ _ _ _to work out.

the problem is very difficult.we can't work it out.(合并一个句)the problem is_ _ _ _to work out.
The problem is too diffcult to work out .