6/ We have done a lot of exercises on Relative Clauses.
A. It was a lot of exercises that we have done on relative clauses.
B. It is a lot of exercises that are have done on relative clauses by us.
C. It is a lot of exercises that has been done on relative clauses by us.
D. It is a lot of exercises that have been done on relative clause by us.
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Phạm Đăng Đức
D. It is a lot of exercises that have been done on relative clause by us.
Đỗ Hồng Hưng
It is a lot of exercises that have been done on relative clauses by us.
Đỗ Bảo Giang
It is a lot of exercises that has been done on relative clauses by us.
Đỗ Bảo Phương
It is a lot of exercises that are have done on relative clauses by us.
Phạm Đăng Ánh
It was a lot of exercises that we have done on relative clauses.