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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