though we do not know what was discussed,yet we can feel the topic _____(a)a has been changed b was changedwhy a

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though we do not know what was discussed,yet we can feel the topic _____(a)a has been changed b was changedwhy a
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though we do not know what was discussed,yet we can feel the topic _____(a)a has been changed b was changedwhy a
though we do not know what was discussed,yet we can feel the topic _____(a)
a has been changed
b was changed
why a

though we do not know what was discussed,yet we can feel the topic _____(a)a has been changed b was changedwhy a
用现在完成时作谓语动作对现在的影响,was changed只表过去发生的动作,由题可知句子含有推测成分且对我们有一定的影响,即我们不知道将讨论什么,因此a更合适些,明白了没?