Many species of animals must have been (A) and can easily (B) become extinct if we don’t make (C) an effort (D) to protect them.

Câu hỏi :

Many species of animals must have been (A) and can easily (B) become extinct if we don’t make (C) an effort (D) to protect them.

A must have been

B easily

C don't make

D an effort

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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