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

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

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

It is known that water is not an endless resource，________can it be made once more，so we should save and protect it.

A. so 　　　　　　 B. as 　　　　　 C. thus 　　　　 D. nor

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

       A．the, /                  B．an, one              C．an ．that           D．/, one

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

1. A.
   the, /
2. B.
   an, one
3. C.
   an . that
4. D.
   /, one