[单选题]It is quite necessary for a teacher to have good manners and__________ knowledge.

A
extensive
B
expensive
C
intensive
D
expressive
正确答案:A
题目解析
extensive广泛的;expensive昂贵的;intensive强烈的;expressive有表现力的句意:作为一名教师,有良好的礼貌和广博的知识是非常必要的。
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