单项选择题

Consumers deprived of the information and advice they needed were quite simply ______ every cheat in the marketplace.

A．at the mercy of
B．in lieu of
C．by courtesy of
D．for the price of
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单项选择题
The Committee pronounced four members expelled for failure to provide information in the ______ of investigations.
A．case
B．chase
C．cause
D．course
单项选择题
It would then be replaced by an interim government, which would ______ be replaced by a permanent government after four months.
A．in step
B．in turn
C．in practice
D．in haste
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