The song____(sing) many times by the students in the past several months

The song____(sing) many times by the students in the past several months
The song____(sing) many times by the students in the past several months

The song____(sing) many times by the students in the past several months
应该填 has been sung
用现在完成时的被动语态.
在过去的几年间这首歌被学生们唱了很多遍.