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
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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.。