Stephen Hawking believes that the carts is unlikely to be the onl_英语解答

Stephen Hawking believes that the carts is unlikely to be the only planet ( ) life has developed gradually .
A that B,where C,which D,whose

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解答

B.wherewhy ?可以分析一下吗where 作定语从句life has developedgradually 的地点状语，即 life has developedgradually （in the planet）