Though we dont know what was discussed,yet we can feel the topic____.A was changed B has been changed为什么选B 选A错在哪里

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Though we dont know what was discussed,yet we can feel the topic____.A was changed B has been changed为什么选B 选A错在哪里

Though we dont know what was discussed,yet we can feel the topic____.A was changed B has been changed为什么选B 选A错在哪里
Though we dont know what was discussed,yet we can feel the topic____.
A was changed B has been changed
为什么选B 选A错在哪里

Though we dont know what was discussed,yet we can feel the topic____.A was changed B has been changed为什么选B 选A错在哪里
现在完成时可以表示某件事对现在造成的影响或几件事发生的先后顺序
很显然,从这句话的意思中可以看出主题被改变发生在 we dont know what was discussed
之前,用现在完成时更加确切.

Can

yet,现在完成时的标志性词语，一般用于否定句和疑问句中，在否定句中意为还，在疑问句中意为已经，通常放句末。现在完成时表示事情发生在过去，对现在造成的影响，用在这里的话有已经的意思，尽管我们不知道讨论了什么，但是我们已经感觉到话题被改变了。这是现在完成时的被动语态，由yet确定了用现在完成时，最后确定用被动语态。...

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yet,现在完成时的标志性词语，一般用于否定句和疑问句中，在否定句中意为还，在疑问句中意为已经，通常放句末。现在完成时表示事情发生在过去，对现在造成的影响，用在这里的话有已经的意思，尽管我们不知道讨论了什么，但是我们已经感觉到话题被改变了。这是现在完成时的被动语态，由yet确定了用现在完成时，最后确定用被动语态。

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