2. 专升本
  3. A new technique______, the yields as a whole increased by 20 percent.

A new technique______, the yields as a whole increased by 20 percent.

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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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