题目内容
I think ___ good knowledge of English is ___ great help when you are traveling around the world.
| A.X,a | B.a,a | C.a,the | D.a,x |
A
a knowledge of 指哪一门学科知识,这个时候可数;动词用做名词,前面经常使用冠词a .
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| A.X,a | B.a,a | C.a,the | D.a,x |