I think knowledge of the Internet is must in our work today.A. a…..aB. the….anC. the….th

发布时间：2020-08-17 12:32:18

I think      knowledge of the Internet is      must in our work today.
A. a…..a
B. the….an
C. the….the
D. /…an

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(答案→)A. a…..a
B. the….an
C. the….the
D. /…an
解析：a knowledge of 是固定搭配，意为：对….了解。must是名词,意为:必要条件。
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