The theory that the 1908 Tunguska event was the explosion of a co

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The theory that the 1908 Tunguska event was the explosion of a cosmic body in the sky over Siberia is _____: no one has yet found fragments of the object or any impact craters in the affected region.

A、long-standing
B、indisputable
C、plausible
D、uncontested
E、unproven

答案：E

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