（）as much as one-fourth of all timber harvested is not used proved to be false.
考试：
科目：（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：
【解析】分析句子可知，The estimate是句子主语，谓语动词是proved，宾语是不定式短语to befalse，中间as much as one-fourth of all timber harvested is not used表达是that引导的同位语从句，对主语The estimate的内容做解释说明；在该同位语从句中，主语是as much as one-fourth，of all timber表达of all timber是其后置定语，而harvested表达harvested则是后置定语修饰限定前面的timber，从句的谓语动词是is not used。
A项代入，缺乏同位语从句引导词that, —般来讲引导同位语从句的that不省略；B项代入，恰弥补A项的缺憾，是正确项；C项和D项代入，整个句子谓语动词过多，不能形成有效表达。
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（）as much as one-fourth of all timber harvested is not used proved to be false.
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