单项选择题

The water in this part of the river has been contaminated by sewage (污水).

A．polluted
B．downgraded
C．mixed
D．blackened
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单项选择题
The conclusion can be deduced from the premises.
A．argued
B．derived
C．permitted
D．come
单项选择题
The old lady let her flat to an English couple.
A．offered
B．rented
C．provided
D．sold
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