without the dreams of the younth,this inventionmight __for a
without the dreams of the younth,this inventionmight __for a century A have been postponed
B has been postponed C postpone D be postponed 求详解,
B has been postponed C postpone D be postponed 求详解,
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D
might是个情态动词,后面只能跟原型.但是invention被推迟,是一个被动式,所以用be postponed
might是个情态动词,后面只能跟原型.但是invention被推迟,是一个被动式,所以用be postponed
1年前
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