________as much as one-fourth of all timber harvested is not used.A、Being estima

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问题 ________as much as one-fourth of all timber harvested is not used.

选项 A、Being estimated that
B、It estimates that
C、It is estimated that
D、That is estimated
E、There is estimated

答案 C

解析本题考查主语从句。it做形式主语，that引导主语从句充当句子真正主语。it与“估测”之间是被动关系，故应该用“It is estimated that”。根据语法，故选C。

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