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A new technique _________ the yields as a whole increased by about 30 percent.

[  ]

A.had applied

B.having applied

C.to have applied

D.having been applied

答案:D
解析:

句意为:“由于采用了新工艺,产量总体上增加了百分之三十。”本题考查独立主格结构。a new technique在逻辑上它是非谓语动词apply 的逻辑宾语,而本句的非谓语动词的动作又发生在谓语动词之前,所以应用having been applied。句子的完整形式是:Because a new technique had been applied,the yields as a whole increased by about 30 percent.


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