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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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
单项选择题
While shopping in a department store, I______ left my purse lying on a counter.
A．initially
B．fortunately
C．intentionally
D．accidentally
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