You can not imagine the difficulty they had ____ the problem

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 郎智 1年前他留下的回答 已收到2个回答

心kanhai 春芽

该名网友总共回答了13个问题，此问答他的回答如下：采纳率：92.3%

答案选 A.to solve; so

1年前他留下的回答

8

missta 网友

该名网友总共回答了5个问题，此问答他的回答如下：

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

1年前他留下的回答

2

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