2. 外语
  3. Threats from nomadic people in the north were 【C1】______ throughout Chinese history. They were continually attacking the Chine

Threats from nomadic people in the north were 【C1】______ throughout Chinese history. They were continually attacking the Chine

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问题      Threats from nomadic people in the north were 【C1】______  throughout Chinese history.  They were continually attacking the Chinese northern 【C2】______  . With each new emperor, came endless debate about how to   【C3】______  the barbarians. There were four options: 【C4】______  offensive campaigns to drive them away or to destroy them; create defensive garrisons; develop diplomatic and 【C5】______  ties with them, or build a wall to keep them out.
     All the options were 【C6】______  at various times.  Experience showed that 【C7】______  campaigns were too costly and very risky, 【C8】______  defensive garrisons could not respond quickly enough 【C9】______  lightning attacks along a long border. The third option would seem to be a very 【C10】______  one and it was in fact tried successfully 【C11】______  a couple of occasions. Wall building became the most favored option in many dynasties. The three dynasties which 【C12】______  the most walls were the Qin, the Han and the Ming.
     The effectiveness of the Great Wall in history is still a controversial 【C13】______  Historical records show that the wall 【C14】______  at many times 【C15】______  repel invaders. Only on two occasions when a dynasty weakened from 【C16】______  were invaders from the north 【C17】______  advance and conquer. 【C18】______  , scholars think the Chinese wall builders were themselves responsible for the unrest on the border. The nomads were people who did not farm, so they 【C19】______  trade with China for many essentials. When the Chinese refused to trade with them, they had no option 【C20】______  raid border towns.
【C12】
选项 A、built
B、were building
C、have been building
D、were built
答案A
解析 动词时态题。修建长城发生在过去，此处应该用动词过去时主动态，故答案为A ，此句意为“有三个朝代修建长城最多，它们是秦朝、汉朝和明朝。”
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