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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.
Physics and mental exercise has been found to be beneficial to our brains, but scientists have now found it could also improve the learning ability of our children.
A. Physics
B. has been
C. it
D. learning ability
Physics and mental exercise has been found to be beneficial to our brains, but scientists have now found it could also improve the learning ability of our children.
A. Physics
B. has been
C. it
D. learning ability
Chủ ngữ là "Physics and mental exercise": cụm hai danh từ nối với nhau bằng and => cụm danh từ số nhiều nên động từ chia theo S số nhiều
Đáp án B => have been
Đáp án B => have been
Đáp án B.