Old-growth forests are Adefine as being at least 250 Byears old, though some forests Care actually far older, with a few that ar

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问题 Old-growth forests are Adefine as being at least 250 Byears old, though some forests Care actually far older, with a few that are Dapproaching one thousand years.

选项 A、 
B、 
C、 
D、 

答案A

解析 Define is incorrect after are because it is not the passive form. Correction: defined.
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