21、____to the reproductive rates of other small mammals, that of the bat is very low indeed. A Compared B It is compared C To be comparing D Have compared 问:逗号后面的句子是分句还是主句呢?? 答:做题首先找谓语动词is,那么是个句子,逗号前面没有谓语,因为没有连词,一个句子就只能有一个谓语。所以前面肯定是个状语,定语,之类的,后面是个完整结构的句子。所以b,d就不对了,因为它们有谓语,而题目中不缺谓语。C呢,语法上就不对,如果是to be compared还差不多,comparing是动名词应该有宾语的,而空格后是个to,无宾语。只有A,构成过去分词短语作状语。
21、____to the reproductive rates of other small mammals, that of the bat is very low indeed. A Compared B It is compared C To be comparing D Have compared