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Before the investigation of Kohoutek．where had methyl cyanide been known to exist?
A．，In comets
B． On asteroids
C．Between Jupiter and Neptune
D．Beyond the Earth’s solar system

A.where
B.，In
C.Between
D.Beyond

【参考答案】

D
根据文章中间“…methylcyanideandhydrogencyanide--neverbeforese......

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