He has been very interested in doing research on since he was at high school.

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He has been very interested in doing research on since he was at high school.

He has been very interested in doing research on _______ since he was at high school.

A. biology

B. biological

C. biologist

D. biologically

Đáp án A

biology (n): môn,ngành sinh học
biological(adj): thuộc sinh học
biologist(n): nhà sinh học
biologically (adv):về mặt sinh học
Dịch nghĩa: Anh ấy đã rất hứng thú về việc nghiên cứu sinh học từ khi còn học trung học