注意：此页面搜索的是所有试题
题目内容
（国家开放大学-人文英语3）
They can join online groups to ______.
选择一项：
A. receive homework
B. discuss the quizzes
C. exchange questions and answers about the courses
选择一项：
A. receive homework
B. discuss the quizzes
C. exchange questions and answers about the courses
参考答案