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题目
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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

答案
C
解析

核心考点
试题【A new technique_________, the yields as a whole increased by 20 percent.A.workin】;主要考察你对现在分词等知识点的理解。[详细]
举一反三
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A.to holdB.hold
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A.triedB.trying
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题型:不详难度:| 查看答案
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