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About 15 years ago, scientists did many experiments (develop) _____ the tools to
About 15 years ago, scientists did many experiments (develop) _____ the tools to
游客
2023-09-25
13
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问题
About 15 years ago, scientists did many experiments (develop) _____ the tools to detect new planets.
选项
答案
to develop
解析
本题考查动词不定式。do sth.to do“为了……做某事”。
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