下题选A选D?without the dreams of the younth,this invention might ___for a century A have been postponed B has been postponed C postpone D be postponed

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下题选A选D?without the dreams of the younth,this invention might ___for a century A have been postponed B has been postponed C postpone D be postponed
下题选A选D?
without the dreams of the younth,this invention might ___for a century
A have been postponed B has been postponed
C postpone D be postponed

下题选A选D?without the dreams of the younth,this invention might ___for a century A have been postponed B has been postponed C postpone D be postponed
考点,情态动词表推测的用法
A(如果)没有青年的梦想,这项发明可能会被推迟了一个世纪.

D,被动

D吧,A不是完成时么?

A啊 对过去进行推测 且对现在有影响

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