同学你好，该知识点来自沪江网校《英语零基础直达大学六级【全额奖学金班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
The diving team, who work at a depth of sixty feet, went down last week
这部分是一句

and first the work went well.
这里是一句，and去掉

Suddenly, one diver working at the dark reported that he had been frightened out of his wits by giant fish bumping into him as he worked.
one可以改成a， at the dark改成in the dark
as he worked改成when he was working强调他正在工作比较好

It was sounded like a joke, so the others on the rigs laughed, but the diver believed that the giant fish must be a monster.
was去掉，这里不是被动

They found that the fish were not sharks or killer whales, but favourite eating varieties like cod and skate which grow to unnatural sizes.
作文中不应该出现和其他材料如课文等相同或者很高程度相似的句子。

Sometimes, the cod was eight feet in length and the skate was twelve feet across.
was可以改成can be，表示可能达到某种程度

祝同学学习进步~