by now we _____ what has happened to those people A has known B has got to know

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by now we _____ what has happened to those people A has known B has got to know
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by now we _____ what has happened to those people A has known B has got to know
by now we _____ what has happened to those people A has known B has got to know

by now we _____ what has happened to those people A has known B has got to know
AB都不对,应该是
have got to know

应该是have known 因为we 是复数

选A 表示已经知道了。
B是说我们要去了解发生了什么,与by now一起用意思不妥,by now是到现在为止,所以如果是用B的话,最好是只用now

都不对,不可能是has