Youcannotimaginethedifficultythey

发布时间：2020-07-10 20:55:13

You can not imagine the difficulty they had ________ the problem．It is not ________ easy．













A.to solve; so












B.solved; so











C.solving; that











D.solved; that

网友回答

C
以上问题属网友观点，不代表本站立场，仅供参考！