One or perhaps more pages ______ missing.A.isB.areC.has beenD.have been

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One or perhaps more pages ______ missing.

A.is

B.are

C.has been

D.have been

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。