David,there---------a dictionary and some books on your desk.A.is B.are C.has D.have请详细说明.

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David,there---------adictionaryandsomebooksonyourdesk.A.isB.areC.hasD.have请详细说明.David,there---------

David,there---------a dictionary and some books on your desk.A.is B.are C.has D.have请详细说明.
David,there---------a dictionary and some books on your desk.A.is B.are C.has D.have
请详细说明.

David,there---------a dictionary and some books on your desk.A.is B.are C.has D.have请详细说明.
is
这事there be 句型的就近原则.即be动词与和他靠近的那个名词的单复数保持一致.
题目中,靠近be的是a dictionary ,为单数,所以用is

is 对于there be句型,只要后面的并列成分第一个不为复数,谓语动词便可用单数

A.is
there 后面的谓语动词单复数,采取就近原则
a dictionary 是单数,所以谓语动词用is

is 根据邻近一致原则

there be句型其实是一种倒装句,这句话可以换成a dictionary and some books ()there on your desk,所以应该使用be动词的复数形式——are