A imaginatively B recently C carefully D unscientifically E accidentally F satisfactorily Man did not succeed in making rain un

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问题 A imaginatively
B recently
C carefully
D unscientifically
E accidentally
F satisfactorily
Man did not succeed in making rain until quite______.

选项

答案B

解析答案的依据在第二段：But exactly what starts the formation of raindrops was not known until quite recently。

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职称英语卫生类B级

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