问题
选择题
There ________ a book on the floor .
A. am B. is C. are
答案
答案：B
此题重点是there be结构，因book是可数名词单数所以be应是is.
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There ________ a book on the floor .
A. am B. is C. are
答案：B
此题重点是there be结构，因book是可数名词单数所以be应是is.