I b_____ all the students can pass the exam with the teacher's he_英语解答

I b_____ all the students can pass the exam with the teacher's help.

人气：216 ℃　时间：2019-08-19 13:49:03

解答

believe我个人认为是believed,不知对不对？不对，要是 believed后面不是can应该是could