A new technique, the yields as a whole increased by 20 percent.A. working outB. having wor

发布时间:2020-08-16 12:38:43

A new technique    , the yields as a whole increased by 20 percent.
A. working out
B. having worked out
C. having been worked out
D. to have been worked out

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A. working out
B. having worked out
(答案→)C. having been worked out
D. to have been worked out
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