Stephen Hawking believes that the earth is unlikely to be the only planet life h
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Stephen Hawking believes that the earth is unlikely to be the only planet _life has developed gradually.
A.that
B.where
C.which
D.whose
试题答案
B
解析：考查定语从句。Where在从句中做状语。“霍金认为地球不可能唯一有生命进化的星球。”