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关于there be 句型

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关于there be 句型
请问事处以下哪句是错误的?为什么?
There is a book and two pens on the desk
There are two books and a pen on the desk
There are a book and a pen on the desk
there is a book,two pens on the desk
第3句肯定是错的,因为there be句型是就近原则,后面是a book,是单数,所以be动词应该用is;第4句一般来说,2个名词之间是要加and的.