--who's this in the picture?--Is __ Tom?A he B it C that D this (并解析)

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--who's this in the picture?--Is __ Tom?A he B it C that D this (并解析)
--who's this in the picture?--Is __ Tom?A he B it C that D this (并解析)

--who's this in the picture?--Is __ Tom?A he B it C that D this (并解析)
选B
因为说话人不能确定,故用it指代