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
答案及解释

考点：情态动词表推测的用法
答案：A
翻译：（如果）没有青年的梦想,这项发明可能会被推迟了一个世纪.
解析：postpone推迟
主语是this invention 这项发明,显然要用被动语态排除C
might 情态动词接动词原形排除 B
表示肯定推测语气不太强烈 might have done 此处用被动语态排除C
所以是might have been done 选择A

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