Air pollution, together with (A) littering, are (B) causing many (C) problems in our large, (D) industrial cities today.

Câu hỏi :

Air pollution, together with (A) littering, are (B) causing many (C) problems in our large, (D) industrial cities today.

A with

B are

C many

D in our large

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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