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【简答题】
下列不属于废水硝化反应条件的是（ ）。
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反馈参考答案：
举一反三
【单选题】They ___ every means, but the engine __ work.
A.
tried; couldn't
B.
have tried; won't
C.
tried; won't
D.
have tried; can’t
【单选题】Every means , but none proved .
A.
have tried; a success
B.
have been tried; successful
C.
has tried; to be successful
D.
has been tried; successful
【简答题】新民主主义社会的起止时间是 年到 年。
【单选题】_____many times, they succeeded _________ the experiment.
A.
Having tried; in doing
B.
Tried; in being done
C.
Having tried; to do
D.
Tried; doing
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