单选题：A new technique （　　）, the yields as a whole increased by 20

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  • 题目类型：单选题
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题目内容：
A new technique （　　）, the yields as a whole increased by 20 per cent. A．working out
B．having worked out
C．having been worked out
D．to have been worked out

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答案解析：

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分类：公共英语四级  题型：单选题
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Read the following text(s) and write an essay to 1) summariz

Read the following text(s) and write an essay to 1) summarize the main points o

分类：公共英语四级  题型：单选题
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