Reading these books boring,A.is,is not it B.are,are not they在两个选项里选一个,

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Readingthesebooksboring,A.is,isnotitB.are,arenotthey在两个选项里选一个,Readingthesebooksboring,A.is,isnotitB.

Reading these books boring,A.is,is not it B.are,are not they在两个选项里选一个,
Reading these books boring,A.is,is not it B.are,are not they
在两个选项里选一个,

Reading these books boring,A.is,is not it B.are,are not they在两个选项里选一个,
A
Reading these books 整体作主语,谓语动词为单数

选A啊!Reading books 是主语嘛~