问题
选择题
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
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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