--I hear that a famous scientist will e to give us a talk. Do you know ______? --About the development of the modern science.A.when he will eB.when will he eC.what he will talk aboutD.what will he talk about
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C解析此题重点考查宾语从句的时态和语序问题，无论哪种句式结构充当宾语从句都要用陈述句语序，从句的时态要和主句的时态保持一致。