For thousands of years, man (A) has created sweet-smelling (B) substances from wood, herbs, and flowers and using them (C) for perfume or (D) medicine. A. man B. sweet-smelling C. using them

For thousands of years, man (A) has created sweet-smelling (B) substances from wood, herbs, and flowers and using them (C) for perfume or (D) medicine

A. man
B. sweet-smelling  
C. using them
D. or

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Đáp án C

Sửa using them -> used them

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