Air pollution, together with littering, are causing many problems in our large, industrial cities

Câu hỏi :

Choose A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.

A. with littering

B. are causing

C. many problems

D. industrial cities

* Đáp án

B

* Hướng dẫn giải

Đáp án B

Are causing => is causing

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