(A) Some underground water is (B) enough safe to drink, (C)  but all the surface water (D) must be treated.

Câu hỏi :

(A) Some underground water is (B) enough safe to drink, (C)  but all the surface water (D) must be treated.

A Some 

B enough safe

C but 

D must be treated.

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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