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