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单选题
The heart is an important organ of circulation _________ function is to pump blood to all parts of the body.
A
which
B
whose
C
of it
D
its
答案解析
正确答案：B
解析：
参考解析:选项A的which应该在定语从句中担任一定的成分，但空格之后的句子是主系表结构，主谓成分已经很齐全，所以不适合; 选项C不能使原句的结构成立; 而假如把its放在空格处，在其前应该加句号将两句分开，故D也不合适;选项B的whose作关系代词时，既可指人，也可指物，符合题意，故选B。
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