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单选题
Stephen Hawking believes that earth is unlikely to be the only planet ______ life has developed gradually.
A

that

B

where

C

which

D

whose


参考答案

参考解析
解析:
句意:Stephen Hawking认为,地球不可能是生命逐渐发展的唯一一个星球。the planet在从句中作状语,故要用关系副词where,相当于on which。故答案是B项。
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