Parks which are found in downtown areas where office workers and store employees can enjoy their lunch hours sitting on the green grass in clean, fresh air.
(A) Which
(B) Employees
(C) Lunch hours sitting
(D) Fresh air
Giải thích
Đáp án A, bỏ which
câu thiếu động từ chính, nên không dùng mệnh đề quan hệ.