I'm not sure of that .He is going to Shanghai(将两句话合并成一句话)I'm not sure _____ he is going to Shanghai ______ _______ .

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I'm not sure of that .He is going to Shanghai(将两句话合并成一句话)I'm not sure _____ he is going to Shanghai ______ _______ .
I'm not sure of that .He is going to Shanghai(将两句话合并成一句话)
I'm not sure _____ he is going to Shanghai ______ _______ .

I'm not sure of that .He is going to Shanghai(将两句话合并成一句话)I'm not sure _____ he is going to Shanghai ______ _______ .
wether or not
后面有or not结构的一般只用whether与其搭配 ^ ^