30.The extra room________very useful when we had visitors.A.had been provedB.was provedC.had provedD

题目简介

30.The extra room________very useful when we had visitors.A.had been provedB.was provedC.had provedD

题目详情


30.The extra room________very useful when we had visitors.
A.had been provedB.was proved
C.had provedD.Proved
题型:单选题难度:偏易来源:不详

答案

D

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