题目内容
This is a very convenient place to live in, is an airport connecting all the big cities.
| A．20 km northwest of it | B．20 km northwest of which |
| C．northwest 20 km to it | D．northwest 20 km of which |
B
解析试题分析：句意：这是一个非常方便生活的地方，西北的20千米处，有一个机场连接了所有的大城市。通过分析句子结构，可知这个句子中包含了一个非限制性定语从句，“西北的20千米处”，应该说20 km northwest of which，选B。
考点：考查非限制性定语从句
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