An increased number of city dwellers has made the obsolete infrastructure

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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 An increased number of city dwellers has made the obsolete infrastructure worse and required a lot of repairs in these days

has made

obsolete infrastructure

required

repairs

Giải thích

Đáp án A

- A number of + N số nhiều + V chia số nhiều

ð Đáp án A (has made => have made)