单项选择题

Without the help of the government few people along the river would______ the recent flood.

A．survive
B．retain
C．maintain
D．sustain
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单项选择题
It is indeed much more difficult to______ a social reform on a large scale than just to talk about it.
A．bring up
B．bring forward
C．bring about
D．bring in
单项选择题
Sometimes they______ their students' poor comprehension to a lack of intelligence.
A．contribute
B．distribute
C．attribute
D．oblige
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