Without the dreams of the youth,this invention might ____for

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Without the dreams of the youth,this invention might ____for a century.
A have been postponed
B has been postponed
C postpone
D be postponed
书上说这是含蓄虚拟条件句,主句的时态要求与含有条件从句的主句要求相同.所以我觉得应该选D阿但是正确答案是A 请解释

首先,这是一道考察高中情态动词与虚拟语气一起使用表示推测的用法,表示也许已经推迟了一个世纪了,而且for后加一段时间表示动作的完成,应该是完成时,更加说明答案只能是A.精锐长宁天山英语组为您解答

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