I think the song ______by lady gaga are very popular with the student.Aare sung B sung 为什么选B?

问题描述:

I think the song ______by lady gaga are very popular with the student.Aare sung B sung 为什么选B?

这里应该是the songs 是不是打错了?
这句话谓语动词是 gaga 后面的are,这个sing 作非谓语动词.完整形式是(which are)sung,括号内可省略.