For thousands of years, man has created sweet–smelling substances from wood, herbs,

Câu hỏi :

For thousands of years, man has created sweet–smelling substances from wood, herbs, and flowers and using them for perfume or medicine.

A. The jeans about whom I told you about last week are over there.

* Đáp án

C

* Hướng dẫn giải

Đáp án C

using them used them (use chia theo thì hoàn thành của động từ create ở trước)

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