______ number of boys were swimming in the lake, but I didn’t know ______ exact number of them

Câu hỏi :

______ number of boys were swimming in the lake, but I didn’t know ______ exact number of them.

A. A/the 

B. The/an 

C. The/the 

D. A/an 

* Đáp án

A

* Hướng dẫn giải

Đáp án A

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