9、 (2011年南通一模)________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

9、解析:選D?疾槊~性從句。句意:外太空是否存在像地球上一樣的生物還不能確定。whether引導(dǎo)主語從句。

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 (2011年南通一模)________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

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