问题补充:
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
答案:
(答案→)A. X,a
B. a,a
C. a,the
D. a,x
解析: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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