单项选择题

In the modern politics, each party has formal election procedures ______ to choose its leader.

A. from what
B. through which
C. from which
D. through what
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单项选择题
The danger is that natural processes are being so fundamentally altered by human activities that once ______ these changes cannot be switched off.
A. begins
B. having begun
C. beginning
D. begun
单项选择题
It has created a world of mobility: of rapid and ______ change, with attention focused mainly on novelty or utility.
A. increasing
B. constant
C. lengthy
D. consistent
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