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
Giải bởi qa.haylamdo.com
Đáp án: C thành “used them”
Giải thích: Ở phía trước động từ đang được chia ở thì hiện tại hoàn thành has created => động từ ở đây cũng như vậy, tuy nhiên ko cần dùng has used nữa, mà chỉ cần dùng used là được.
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