题目内容
I think ___ knowledge of the Internet is ____ must in our work today.
| A.a…..a | B.the….an | C.the….the | D./…an |
A
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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| A.a…..a | B.the….an | C.the….the | D./…an |