After the students had learnt about the benefits of recycling and reusing, they…..collecting waste paper, bottles, and cans tờ recycle and reuse
A.had started B.Start C.Have stated D.Started
Giúp mình ạ
After the students had learnt about the benefits of recycling and reusing, they-.collecting waste paper, bottles, and cans tờ recycle and reuse A.h
By Charlie
After the students had learnt about the benefits of recycling and reusing, they…..collecting waste paper, bottles, and cans tờ recycle and reuse
A.had started
B.Start
C.Have stated
D.Started
đây là cấu trúc của after
after + QKHT, QKĐ
started
Thì QKHT diễn tả một hành động xảy ra trước một hành động khác trong quá khứ
Hành động “Start” ở đây là hành động xảy ra sau, chia thì QKĐ