问题
选择题
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
答案
答案：B
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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
答案：B