( ) 3. Scientists are doing experiments in order more of Mars.
A. exploring B. to explore
C. explore D. to exploring
3. B in order to do sth.意为"为了
题目来源:仁爱英语同步练习簿九年级上下册 > Topic 2 I'm excited about the things that will be discovered in future.
科目:初中英语 来源: 题型:
2. Astronauts China, the United States and Russia will take part the space flight.
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