what is on the floor?there is.A、a book and a baseball and so

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what is on the floor?there is.A、a book and a baseball and some CDs
B、a book,a baseball,some CDs,C、a book,aaseball and some CDs D、a book,abaseball or some CDs

C 正确
There + be 句型,be 要和最靠近的主语（这里是“a book)在数上保持一致,
几个并列主语,在最后两个之间用连词and,or
and 一般用于肯定句,or 一般用于否定句
再问： you, those, to,school,can,bring,things,连词成句
再答： You can bring those things to school
再问：疑问句
再答： Can you bring those things to school?

what is on the floor?there is.A、a book and a baseball and so There is a book and two pens on the desk. There is a soccer ball and a basketball on the floor.改成一般疑问句 there is (a soccer ball and a basketball) on the floor.括号提问 There is a book on the desk,and ____is an English book A.tha There is a book,two pencils and a box on the desk.请问用There i there is a key and a book a book on the floor 和 a book is on the floor有什么区别? there is a d< >near the window,and an english book is on it There is a book and a pen on the desk.(变为否定句) There is a book and a pen on the table改为复数句 there is a set of keys,a book and some chalk on the desk?