单项选择题

We must ______ our strength and swim vigorously up stream.

A．sum up
B．summon up
C．catch on
D．watch out
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单项选择题
______ your suggestions deserve considering, the board thinks it unwise to invest so large a sum of money into the project.
A．Assuming
B．While
C．Since
D．As
单项选择题
They put forward those facts that ______ or illuminate the main question at hand.
A．pour scorn on
B．heap praise upon
C．give vent to
D．cast light upon
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