Who ____the students_____? A are listening B are listen C is listening D are listening toWho ____the students_____? (D)A are listening B are listen C is listening D are listening to答案为什么选D,而不是B? 请讲一下.

问题描述:

Who ____the students_____? A are listening B are listen C is listening D are listening to
Who ____the students_____? (D)
A are listening B are listen C is listening D are listening to
答案为什么选D,而不是B? 请讲一下.