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there are( ) on the desk.A.some paper B.five pieces of paper

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there are( ) on the desk.A.some paper B.five pieces of paper C.five piece of paper D.a piece of
there are( ) on the desk.(填空)
A.some paper B.five pieces of paper C.five piece of paper
D.a piece of papers
B.five pieces of paper
此处的paper为不可数名词,所以没有复数形式;量词piece为可数名词,所以当前面的数词大于1时,要变成复数形式.