单项选择题

The moment has came __________ I can fully display my ability.

A．that
B．which
C．when
D．what
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单项选择题
We adopted the new methods with a view to __________ our efficiency.
A．raise
B．raising
C．rise
D．rising
单项选择题
It is essential that we __________ measures to protect the ozone layer.
A．will take
B．should take
C．would take
D．took
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