A new technique______, the yields as a whole increased by 20 percent.

admin2018-08-16 33

问题 A new technique______, the yields as a whole increased by 20 percent.

选项 A、working out
B、having worked
C、having been worked out
D、to have been worked out

答案C

解析句子的前半部分是一个带逻辑主语的独立结构，表示原因。

转载请注明原文地址:https://kaotiyun.com/show/oYPC777K

英语

相关试题推荐

随机试题

最新回复(0)