When you are introduced to someone, you ________ be sure to stand up before shake hands.

Câu hỏi :

When you are introduced to someone, you ________ be sure to stand up before shake hands.

A oughtn’t to  

B needn’t 

C must 

D might

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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