While the teacher was explaining the some on the blackboard, the children threw paper aeroplanes around the classroom. 

Câu hỏi :

While the teacher was explaining the some on the blackboard, the children threw paper aeroplanes around the classroom. 

A around

B threw

C on the 

D was explaining 

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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