【題目】_____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】

試題解析：while當，然而，盡管；because因為；when當；since自從，因為，既然。根據(jù)句意，并結(jié)合個選項的意思，可知選A。

句意：盡管找不到任何生命的跡象，水的出現(xiàn)形式還是有可能的。

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