2. 外语
  3. During the twentieth century, the United States participated in two major wars that required the nation to【C1】________its resour

During the twentieth century, the United States participated in two major wars that required the nation to【C1】________its resour

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问题     During the twentieth century, the United States participated in two major wars that required the nation to【C1】________its resources in the most【C2】______way possible, World War I and World War II . During, each of these wars, the government worked with businesses to switch【C3】________to wartime production, and government【C4】______asked American citizens to do their【C5】______to help the nation to succeed【C6】________
    One major【C7】______was food. During both wars, the government【C8】________that people grow their own food instead of【C9】______them at stores. And these gardens were called "victory gardens"【C10】______emphasize the patriotic nature of these efforts. In order to【C11】______the nation’s war goals, millions of Americans started planting their own gardens In some cases, entire【C12】________came together to plant large gardens【C13】________were divided into smaller plots for each family.【C14】______towns started gardening clubs, and women worked together to preserve【C15】________they grew. Often, classes of school children grew gardens【C16】________the schoolhouse grounds,【C17】______the produce divided up among the children’s families. In addition to【C18】______patriotic activities on the part of the children, teachers were also able to use the gardens to teach about scientific【C19】______. Since the end of World War II, the United States has not been involved in a war that has required so many of the nation’s resources that victory gardens were【C20】________
【C18】
选项 A、courage
B、encourage
C、encouraged
D、encouraging
答案D
解析 空格前的In addition to这个短语中to是介词，后面的动词要相应地变为动名词形式。
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