A new technique______, the yield as a whole increased by 20 per cent.<br>· working out<br>· having worked out<br>·having beeworked out<br>·to have beeworked out

A new technique______, the yield as a whole increased by 20 per cent.
· working out
· having worked out
·having beeworked out
·to have beeworked out

出自：佳木斯大学语言治疗学

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