A new technique ______, the yields as a whole increased by 20 per cent. A.)wording out B.having been worded out C.)having worded out D.to have been worded ou

A new technique ______, the yields as a whole increased by 20 per cent.
A.)wording out
B.having been worded out
C.)having worded out
D.to have been worded ou

出自：三门峡职业技术学院英语读写

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