Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.
For thousands of years, man has created sweet-smelling substances from wood, herbs and flowers and using them for perfumes or medicine.
A. man
B. sweet-smelling
C. using them
D. or
C
Vì “ has created ..... and ....”=> sau “and “ phải kết hợp với P2
=>Đáp án C. Sửa thành “ used them”