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

admin2010-12-12  30

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

选项 A、working out
B、had been worked out
C、having been worked out
D、having worked out

答案C

解析
转载请注明原文地址:https://kaotiyun.com/show/LPAR777K
0

随机试题
最新回复(0)