When it is your turn to talk what I want to tell you is you can show respect by making su

问题补充：

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；what

B. this；which

C. where； that

D. which； when

答案：

(答案→)A. that；what

B. this；which

C. where； that

D. which； when

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.