国家开放大学 / 综合英语（1）
正确率：100%
It is necessary to choose our words carefully when we speak or write in order _ _ _ _ _ _ .
a. to show that we are polite
b. to show that we are good at using them
c. to express exactly what we mean
d. to prove that we are not silly
a. to show that we are polite
b. to show that we are good at using them
c. to express exactly what we mean
d. to prove that we are not silly
参考答案：
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