单项选择题

In order to make myself ______ in English, I am studying hard.

A. understand
B. understanding
C. to understand
D. understood
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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
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
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