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

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

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