Câu hỏi :

- What did I do wrong? -  _______

A  You didn’t have to connect these two wires.  

B You shouldn’t connect these two wires like that   

C You shouldn’t have connected these two wires.                

D You mustn’t connect these two wires like that.

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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