The passage states that in a two-year period astronauts could ­___________.

Câu hỏi :

The passage states that in a two-year period astronauts could ­___________.

A fly to Mars to begin exploring     

B travel to Mars and set up a base there

C only get halfway to Mars      

D go to Mars and return

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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