考试
2020-03-16 07:17:52

2269 A new technique______, th

题目描述

A new technique______, the yields as a whole increased by 20 percent since last year.A.wor



A new technique______, the yields as a whole increased by 20 percent since last year.

A.working out

B.having worked out

C.having been worked out

D.to have been worked out

请帮忙给出正确答案和分析,谢谢!

答案解析

C本题考查非谓语动词,选项中workou

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