30．The extra roomvery useful when we had visitors．A. had been provedB. was provedC. had pr

发布时间：2020-08-15 03:01:28


30．The extra room    very useful when we had visitors．
A. had been proved
B. was proved
C. had proved
D. Proved

网友回答

A. had been proved
B. was proved
C. had proved
(答案→)D. Proved
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