A number of books______ missing from the library during the Second World War.A.beB.beingC.

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A number of books______ missing from the library during the Second World War.

A.be

B.being

C.is

D.are

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_________。