单项选择题

The task before us ______ great courage and perseverance.

A．calls on
B．calls for
C．calls forth
D．calls up
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单项选择题
When he saw the teacher come in, he ______ in the middle of a sentence.
A．broke out
B．broke through
C．broke off
D．broke away
单项选择题
A good speaker knows how to ______ his ideas,
A．display
B．consult
C．confront
D．convey
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