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
In some countries preschool education in nursery schools or kindergartens______ the 1st grade.
A．leads
B．precedes
C．forwards
D．advances
单项选择题
Haven't I told you I don't want you keeping______with those awful riding about bicycle boys
A．company
B．acquaintance
C．friends
D．place
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