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【题目】_____opportunity has not found any sign of life, the presence of water means life is possible.

A.WhileB.Because

C.WhenD.Since

【答案】A

【解析】

试题解析:while当,然而,尽管;because因为;when当;since自从,因为,既然。根据句意,并结合个选项的意思,可知选A。

句意:尽管找不到任何生命的迹象,水的出现形式还是有可能的。

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