there will be a talk ___ the history of china tomorrow .a on b about

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there will be a talk ___ the history of china tomorrow .a on b about
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there will be a talk ___ the history of china tomorrow .a on b about
there will be a talk ___ the history of china tomorrow .a on b about

there will be a talk ___ the history of china tomorrow .a on b about
答案:A
正式的报告一本用介词on,而在口语中通常用about.

on