单项选择题

At the conference, the speaker tried to______ his feelings concerning the urgency of passing the decisions.

A．summon
B．convey
C．impose on
D．affect
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单项选择题
During his four years in Japan, he took great______ to learn to distinguish .fake pearls from genuine pearls.
A．pains
B．actions
C．steps
D．efforts
单项选择题
We ought to______ detailed investigations and studies before we draw any conclusions.
A．administrate
B．process
C．undertake
D．duplicate
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