单选题
8.
______ as much as 1/4 of all timber harvested has not been used.
A、
That is estimated
B、
It is estimated that
C、
There is estimated
D、
It estimates that
【正确答案】
B
【答案解析】
此句中的it为形式主语，that引导的从句为真正的主语。
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