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Insomeculturesfriendship()astronglife-longbondbetweentwopeoplewhileAmerican(见下方)friendships()quicklyandmaybechangejustasquicklyA.meant;developB.ismenat;aredevelopingC.means;developedD.means;develop该题正确答案应

题目详情
In some cultures friendship( )a strong life-long bond between two people while American(见下方)
friendships( )quickly and maybe change just as quickly
A.meant;develop B.is menat;are developing C.means;developed D.means;develop
该题正确答案应选D,为什么不能选C?
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答案和解析
while表示然而,前后两句并列,所以时态应该保持统一,所以C不对~