单选题Anewtechnique_________theyieldsas

单选题 A new technique _________ the yields as a whole increased by about 30 percent．A.had appliedB.having appliedC.to have appliedD.having been applied

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.。

和我的回答一样，看来我也对了