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You konw,__konwledge of__computer is necessary to a secretar

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You konw,__konwledge of__computer is necessary to a secretary.
为什么填a;/,尤其是第一个空
a knowledge of sth 知道某事,是个固定短语
computer 在这里不是指具体某一台电脑,而是用作抽象名词,泛指“计算机”“电脑”,所以前面不用冠词
你知道,懂电脑对一个秘书来说是必须的.
类似于a knowledge of 这个短语的还有：
an area of
a history of
a population of...
...
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英语翻译a file necessary to the desinstallation is corruted you When do you think is necessary to tell a lie? 英语翻译If you want to konw what a truly healthy relationship is It's a long way,so ____ is necessary ____ you to take enough 1.Do you think it is necessary for a college student to stud Do you konw what letter is a kind of drink? it is necessary for me to take a taxi中用动词来代替it is necessary It is necessary for you to finish the work today I know it is necessary fou you to learn Eglish. It is necessary for you to help each other. It is necessary for you to take an Is it necessary for you to make so much noise?