________ there are living creatures in the outer space as those on Earth hasn't been proved until now.

A．How B．When

C．Where D．Whether

 

D

【解析】D 考察主語(yǔ)。句意：在外部空間是否有與地球相同的生物直到現(xiàn)在還沒(méi)有得到證明。Whether引導(dǎo)主語(yǔ)從句，意為是否。

 

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