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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
Earth Day is a day when many people gather to plant trees and cleaning up parks
A. Earth Day
B. when
C. gather
D. cleaning up
Earth Day is a day when many people gather to plant trees and cleaning up parks
A. Earth Day
B. when
C. gather
D. cleaning up
Phương án D được sửa lại là to clean
Đáp án D.