Without the dreams of the youth,this invention might ____for
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