Itisknownthatwaterisnot

問題詳情：

It is known that water is not _____ endless resource, nor _____ that can be made once more. 

 A. the; 不填      B. an; one       C. an; that         D. 不填；one

【回答】

B  

知識點：冠詞

題型：選擇題