This book ___ten units,___three mainly revision
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A.contain 的主语是/相当于容器,宾语是其中的内容.两者一般不是同类.书和10个单元的课文就是这种关系.including作介词用,意为‘包括’.后者和前者是一类,属于前者,是前者的组成部分.如事故中死了10个人,包括三个男孩.Ten people were killed in the accident,including three boys.10个单元的课和三个总复习单元就是这种关系.