______ eighteen century, people began to realize that certain chemical are affected and changed by light.

Câu hỏi :

______ eighteen century, people began to realize that certain chemical are affected and changed by light.

A By the 

B The

C It was the  

D That in the

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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