We are talking about ______ we'll go back tomorrow.(whether,if)

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We are talking about ______ we'll go back tomorrow.(whether,if)
We are talking about ______ we'll go back tomorrow.(whether,if)

We are talking about ______ we'll go back tomorrow.(whether,if)
填whether,这里是选择性假设,其实后面还省略了or not,不能用if.

talking about 介词后边只能用whether;