______ abundant certain natural resource may be,they cannot reproduce themselves and are bounced to be used up eventually.A.while B.whatever C.although D.however
问题描述：
______ abundant certain natural resource may be,they cannot reproduce themselves and are bounced to be used up eventually.
A.while
B.whatever
C.although
D.however
答
C
因为有转折关系。
（但是总觉得这句话前面应该还有东西。。。）
答
感觉是D,整句“无论有多少自然资源,他们都不能再生且最终都要耗尽”的意思
用however abundant,即“无论有多少”