(单选题)

Many organizations have systems by which people can donate used textbooks which can then ______ to current students.

A.distribute

B.be distributed

C.be distributing

D.have distributed

参考答案：B

参考解析：

考查被动语态。句意：许多组织机构都有系统，人们可以通过这些系统捐赠二手教科书，然后分发给在校学生。分析句子成分可知，which can then ______ to current students充当定语从句，修饰先行词textbooks，而先行词textbooks和谓语动词distribute之间是被动的关系，因此用被动语态。故选B。

知识点：