【单选题】

Always make sure that you know what you want to say and that the words that you use give the meaning that you want.

A、To know what you want to say and to use the words that give the wanted meaning shall always be assureD.
B、In order to express the meaning that you want, always make sure that you know what you want to say and you use the words.
C、Always make sure that you use what you want to say to express the words with the meaning that you want.