2. 外语
  3. Before the 1500’s, the western plains of North America were dominated by farmers. One group, the Mandans,【C1】______ in the upper

Before the 1500’s, the western plains of North America were dominated by farmers. One group, the Mandans,【C1】______ in the upper

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问题      Before the 1500’s, the western plains of North America were dominated by farmers. One group, the Mandans,【C1】______ in the upper Missouri River country, primarily in present-day North Dakota. They had large villages of houses【C2】______ close together.
    The【C3】______  arrangement enabled the Mandans to protect themselves more easily【C4】______  the attacks of others who might seek to【C5】______  some of the food these highly capable farmers stored from one year to the next.
     The women had primary responsibility for the fields. They had to exercise【C6】______  skill to produce the desired results,【C7】______  their northern location meant fleeting growing seasons. Winter often lingered; autumn could【C8】______  by severe frost. For good measure, during the spring and summer, drought, heat, hail, grasshoppers, and other 【C9】______  might await the wary grower.
     Under 【C10】______  conditions, Mandan women had to grow maize capable of weathering【C11】______ They began【C12】______ it appeared feasible to do so in the spring.
     Harvesting  proceeded in【C13】______  stages. In August the Mandans picked a small amount of the crop【C14】______ it had matured fully. This green corn was boiled, dried, and shelled, with some of the maize【C15】______ for immediate consumption and the reststored in 【C16】______  bags. Later in the fall, the people picked the rest of the corn. They saved the best of the harvest for seeds or for trade,【C17】______  the remainder eaten right away or stored for later use in underground reserves. With appropriate 【C18】______  of the extra food, the Mandans protected themselves 【C19】______  the disaster of crop failure and accompanying【C20】______  .
【C2】
选项 A、built
B、building
C、to build
D、build
答案A
解析 have的宾语补足语在理论上A，B和D所表示的形式均可入选，但从与宾语的主被动关系来看，仅A表示被动，因此选A。C项的不定式表示“将来”，不合题意。
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