This book 12 units, the unit of Music.
A. contains, including
B. includes, containing
C. contains, includes
D. including, contains
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(答案→)A. contains, including
B. includes, containing
C. contains, includes
D. including, contains
解析:句意:这本书有12单元,其中包括音乐那个单元。contain是及物动词,接名词或代词作宾语。表示“所属”“构成”关系时,不能用于进行体,不能用于被动结构,也不可用过去分词作定语; include的基本意思是“包含”“包括”,其宾语经常是构成整体的一部分,有时也可以指构成整体的全部。including+sth或sth+ included 。故选A。