Forests ________ and bum at such a fast speed that they will disappear from the earth in the near future, if no immediate action is taken.A.felledB.are felledC.are being felledD.had been felled
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C解析这是一个含有条件状语从句的主从复合句。主句又是一个含有结果状语从句的主从复合句，主句主语为Forests，并列谓语为fell和burn，很明显要求用被动语态。句中…will disappear from the earth in near future暗示了森林不断受到砍伐和烧毁，这一持续的动作要求用进行时，所以