Lots of scientists are working hard _____ send astronauts to Mars. A. so B. but C. in order to D. so...
2022-10-22 04:22:19 32次 天津市五区县2018届九年级一模英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Lots of scientists are working hard _____ send astronauts to Mars.
A. so B. but
C. in order to D. so that
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