Fertilizers are used primarily to enrich the soil and______ yield.

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问题 Fertilizers are used primarily to enrich the soil and______ yield.

选项 A、increasing
B、increase
C、to increase
D、have increased

答案C

解析 to increase用来与to enrich保持结构上的平行。
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本试题收录于: 英语题库普高专升本分类
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