You can not imagine the difficulty they had ____ the problem.It isn’t ____ easy.A.to solve; so B.solved; so C.solving; that D.solved,that为什么

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Youcannotimaginethedifficultytheyhad____theproblem.Itisn’t____easy.A.tosolve;soB.solved;soC.solving;

You can not imagine the difficulty they had ____ the problem.It isn’t ____ easy.A.to solve; so B.solved; so C.solving; that D.solved,that为什么
You can not imagine the difficulty they had ____ the problem.It isn’t ____ easy.
A.to solve; so B.solved; so C.solving; that D.solved,that
为什么

You can not imagine the difficulty they had ____ the problem.It isn’t ____ easy.A.to solve; so B.solved; so C.solving; that D.solved,that为什么
答案选 A.to solve; so

c ,they had 是difficulty 的定语从句,solving 是引导的伴随状语