So many uses have been discovered for this wood the supply of white pine is becoming smal

发布时间：2020-08-17 14:03:42

So many uses have been discovered for this wood      the supply of white pine is being smaller and smaller.
A. then
B. what
C. that
D. which

网友回答

A. then
B. what
(答案→)C. that
D. which
解析：so...that引导的结果状语从句。
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