A new technique( ), the yields as a whole increased by 20 perce.
考试:=$ecms_gr[fenlei]?>
科目:=$ecms_gr[kemu]?>(在线考试)
问题:
A:working out
B:having worked out
C:having been worked out
D:to have been
答案:
解析:
【解析】鉴于“技术”与“研发”在语义上是“被动”关系,故可排除A和B; C和D都可与前面的名词短语A new technique构成独立主格结构,但考虑到worked out和increased两个动作行为的发生时间,可知两者存在明确的“先后”顺序,且前者是后者发生的原因,由此可以排除D (不定式表示将来),C为正确项。C项在语义上相当于一个原因状语从句:As a new technique had been workedout...。
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A new technique( ), the yields as a whole increased by 20 perce.
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