Provide pensions for retired people is the primary function of the social security system

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

Provide pensions for retired people is the primary function of the social security system.

Provide

pensions

retired

the primary function

Giải thích

Đáp án A

Provide => Providing. V-ing đứng đầu câu làm chủ ngữ, động từ theo sau chia ở dạng số ít.