2. 外语
  3. The United States is well known for its network of major highways designed to help a driver get from one place to another in the

The United States is well known for its network of major highways designed to help a driver get from one place to another in the

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问题     The United States is well known for its network of major highways designed to help a driver get from one place to another in the shortest and possible time.【C1】______these wide modem roads are generally【C2】______many well maintained, with【C3】______sharp curves and many straight【C4】______, a direct route is not always the most【C5】______one. Large highways often pass【C6】______scenic areas and interesting small towns. Furthermore, these highways generally【C7】______large urban centers, which means that they became crowded with【C8】______traffic during rush hours,【C9】______the "fast, direct" route becomes a very slow route. However, there is【C10】______always another route to take【C11】______you are not in a hurry. Not far from the【C12】______new "superhighways" there are often older【C13】______of heavily traveled roads which go through the countryside.【C14】______these are good two -lane(双重道)roads; others are uneven roads【C15】______through the country. These secondary routes may go up steep slopes, along high【C16】______, or down frightening hillsides to towns【C17】______in deep valleys. Through these less direct routes, longer and slower, they generally go to places【C18】______the air is clean and the scenery is beautiful, and the driver may have a【C19】______to get a fresh, clean【C20】______of the world.
【C9】
选项 A、when
B、for
C、but
D、that
答案A
解析 首先我们必须清楚，这里使用的是一个非限制性定语从句，在这里只有 when才可以起这种语法作用。
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