Students (A) are not allowed to handle (B) these chemicals (C) if they are under the supervision (D) of a teacher

Câu hỏi :

Students (A) are not allowed to handle (B) these chemicals (C) if they are under the supervision (D) of a teacher

A are

B these

C if

D of

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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