When it is your turn to talk, what I want to tell you is ______you can show respect by making sure the listener understands ______ you are saying and is interested.A.that；whatB.this；whichC.where； thatD.which； when
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A解析考查名词性从句。第一格是在be动词后，所以是表语从句，而表语从句中没有缺少成分，故用that; 第二格，understand后面是宾语从句，从句中缺少saying后面的宾语，故用what.