You will have heard of this 和you must have heard of this 的不同?

You will have heard of this 和you must have heard of this 的不同?

题目
You will have heard of this 和you must have heard of this 的不同?
将来完成时的用法
②表示推测,相当于"must have done"结构.
You will have heard of this,I guess.
那么和这句you must have heard of this,i guess.
两句表示的有什么不同呢?
答案
you will have heard of this,I guess.
届时你应该已经听说过这个了,我猜.(现在还没听说)
you must have heard of this,I guess.
我猜你肯定已经听说过这个了吧. (现在已经听说了)
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