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题目内容
（三门峡职业技术学院英语读写）
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.)wording out
B.having been worded out
C.)having worded out
D.to have been worded ou
参考答案
