（）as much as one-fourth of all timber harvested is not used proved to be false.
考试：MBA考试
科目：英语（在线考试）
问题：
A：The estimate
B：The estimate that
C：They are estimated
D：It is estimated that
答案：
解析：
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（）as much as one-fourth of all timber harvested is not used proved to be false.
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