单项选择题

He never hesitates to make such criticisms（）are considered helpful to others.

A. that
B. which
C. as
D. what

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单项选择题
The problem of （）to select as his successor was quickly disposed of.

A. what
B. which
C. whom
D. how
单项选择题
When will Kyoto Protocol run out according to the news（）

A. 2008.
B. 2010.
C. 2012.
D. 2020.
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