Our classes take place for three hours every morning from Monday to Friday. The (23)

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D to indicate the best option for each of the blanks.

A. in

B. of

C. on 

D. for 

* Đáp án

B

* Hướng dẫn giải

Đáp án B 

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