The hypothesis that the explosion was ca

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问题 The hypothesis that the explosion was caused by a rock colliding with the EarthA. has remained a puzzleB. lacks sufficient evidenceC. is a university professorD. was generated by the explosionE. will kill many animalsF. are attacked by aliens

选项 A. has remained a puzzle
B. lacks sufficient evidence
C. is a university professor
D. was generated by the explosion
E. will kill many animals
F. are attacked by aliens

答案 B

解析

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