2. 外语
  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.

admin2010-05-25  66
问题 A new technique______, the yields as a whole increased by 20 percent.
选项 A、working out
B、having worked out
C、having been worked out
D、to have been worked out
答案C
解析 考查独立结构。根据句子结构，这里应该用独立分词结构，故选项D错误。同时，work out和a new technique是逻辑动宾关系，所以此处只能使用过去分词结构或使用被动语态的现在分词结构。由此可以看出正确答案为C。
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