单项选择题

In 1914, an apparently insignificant event in a remote part Of Eastern Europe ______ Europe into a great war.

A．increased
B．imposed
C．passed
D．plunged
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单项选择题
However, at times this balance in nature is ______ , resulting in a number of possibly un foreseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
单项选择题
Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.
A．by that
B．at that
C．on that
D．in that
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