Choose the best answer A, B, C or D to complete th...

Câu hỏi: Choose the best answer A, B, C or D to complete the sentences.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