Mukai Chiaki, the first female Japanese astronaut, ……….. 15 days aboard

Câu hỏi :

Mukai Chiaki, the first female Japanese astronaut, ……….. 15 days aboard the space shuttle Columbia in space before it …….. to the Earth on July 23,1994.

A. spent - had returned 

B. had spent - returned

C. was spending - was returning 

D. spent - was returning

* Đáp án

* Hướng dẫn giải

Đáp án: B

Giải thích: Hành động xảy ra trước một hành động trong quá khứ

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