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 Lotsofscientistsareworkinghard

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 Lotsofscientistsareworkinghard

 Lots of scientists are working hard __________ send astronauts to Mars one day.

  A. so that                  B. in order                    C. in order to                D. and

【回答】

C

知识点:介词和介词短语

题型:选择题

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