There are many sources of pollution in our modern world. At present, the most

Câu hỏi :

Read the following passage and choose A, B, C, or D to indicate the correct word or phrase that best fits each of the following blanks. Fill in the appropriate word in question 35

A. on

B. in

C. up

D. over

* Đáp án

C

* Hướng dẫn giải

Đáp án C

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