问题描述：
petroleum is to industry____blood is to man.
a that b which c what d as if
a new factory has been built in ___ was a wasteland.
a that b where c which d what
第一个题目中的 as if 不行吗
a that b which c what d as if
a new factory has been built in ___ was a wasteland.
a that b where c which d what
第一个题目中的 as if 不行吗
问题解答：
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