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
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单项选择题
Most of them had visited the invalid often during the past few months, marveling at his ______ spirit and his unfailing good temper.
A．variant
B．gallant
C．pertinent
D．solitary
单项选择题
Consumers deprived of the information and advice they needed were quite simply ______ very 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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