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专升本
A new technique______, the yields as a whole increased by 20 percent.
A new technique______, the yields as a whole increased by 20 percent.
admin
2015-03-13
47
问题
A new technique______, the yields as a whole increased by 20 percent.
选项
A、working out
B、having worked
C、having been worked out
D、to have been worked out
答案
C
解析
句子的前半部分是一个带逻辑主语的独立结构,表示原因。
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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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英语
普高专升本
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