We should participate in Tree-Planting Campaigns _______ our city greener, fresher.

2/50

organizing to make

organized making

organized to make

which organize to make

Giải thích

Đáp án C.

- organize to do sth: tổ chức, sắp xếp làm việc gì đó

Câu ở dạng đầy đủ phải là: “We should participate in in Tree-Planting Campaigns which/that are organized to make our city greener, fresher.

→ rút gọn mệnh đề quan hệ thành “… Tree-Planting Campaigns organized to make …”.