we / be / friends / last school year

 we / be / friends / last school year

GRAMMAR (Ngữ pháp)

Đề bài:

a.      We have been friends since last school year.

b.      We were friends since last school year.

c.      We have been friends last school year.

d.      We are friends since last school year.

a.      We have been friends since last school year.