问题标题：
whoisheman__istalkingwithjohnawhichbwhocwhatdthat
问题描述：
whoisheman__istalkingwithjohn
awhichbwhocwhatdthat
崔亦飞回答：
whoisheman__istalkingwithjohn
选D
因为如果前面没有who的话,可以用who或者that,因为有了who,所以只能用that,选D
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