单项选择题

We ______ his great success to his intelligence and persistence.

A．distribute
B．attribute
C．contribute
D．subject
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单项选择题
The recent airplane crash ______ my belief that stronger safety regulations are needed.
A．infirm
B．affirms
C．firms
D．confirms
单项选择题
The waste pipe is blocked; try ______ it out with hot water.
A．rushing
B．brushing
C．crushing
D．flushing
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