【題目】Stephen Hawking believes that the earth is unlikely to be the only planet ___________ life has developed gradually.

A. that B. which

C. whose D. where

【答案】D

【解析】考查定語從句。先行詞是the only planet，定語從句缺少地點狀語，用where引導定語從句。句意：Stephen Hawking認為地球不可能是生命逐漸發(fā)展的唯一星球。選B。

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