.  None of them ______ my friends.A.isB.areC.wasD.has been

.  None of them ______ my friends.A.isB.areC.wasD.has been

题型:不详难度:来源:

.  None of them ______ my friends.
A.isB.areC.wasD.has been

答案
B
解析

举一反三

. Getting to other planets or to the moon _____ many problems.
A.involveB.involvesC.involvingD.to involve

题型:不详难度:| 查看答案

. In that country, the rich ______ richer, the poor, poorer.
A.becomeB. has becomeC.becomesD.is becoming

题型:不详难度:| 查看答案

. Not one in one hundred children exposed to the disease ______ likely to develop it.
A.should beB.must beC.isD.are

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.Mother ______ us stories when we were young .
A.was used to tellB.is used to tellingC.used to tellD. used to telling

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Every possible means ____, but none ____ successful.
A.has tried; has provedB.tried; proves
C.has been tried; provesD.is being tried; is proved

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