An increasing number of companies has changed dress codes, allowing

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Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.

An increasing number of companies has changed dress codes, allowing employees to wear casual clothing in the work place.

in the working place

has changed

increasing

to wear

Giải thích

Đáp án là B. has changed => have changed. Vì: An number + Ns: nhiều .... , theo sau động từ chia ở dạng số nhiều