According to some optimistists, by the end of the 21st century, our astronauts ______ on Mars.

Câu hỏi :

According to some optimistists, by the end of the 21st century, our astronauts ______ on Mars.

A will be landing

B have landed 

C will land  

D will have landed

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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