Câu hỏi :

We listend to a speech last night. It was informative.

A We listend to a speech last night what was informative.  

B We listend to a speech last night when it  was informative.

C We listend to a speech last night which was informative.

D We listend to a speech last night on which was informative.

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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