单项选择题

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
<上一题 目录 下一题>
热门 试题

单项选择题
If we continue to ignore the issue of global warming, we will almost certainly suffer the ______effects of climatic changes worldwide.
A. dubious
B. drastic
C. trivial
D. toxic
单项选择题
His answer was so confused that I could hardly make any ______of it at all.
A. explanation
B. meaning
C. sense
D. interpretation
相关试题