Elderly people,_______, require constant attention

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Elderly people,_______, require constant attention.

many of whom are financially dependent on the government

a large number's depending on government aid

and many of them depend on the government to finance them

who are dependent many of them on the financing from the government

Giải thích

Đáp án là A. Câu hỏi về mệnh đề quan hệ: Sau giới từ, chúng ta sử dụng “whom” thay thế cho tân ngữ chỉ người “elderly people”