I think ___ good knowledge of English is ___ great help when you are traveling a
题型：不详难度：来源：
| I think ___ good knowledge of English is ___ great help when you are traveling around the world. |
答案
| A |
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 . |
举一反三
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He is in ____ control of the company. I mean, the company is in ____ control of him. | A．the; / | B．/; the | C．the; the | D．/; / |
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