单项选择题

The negotiations which ______ the signing of the treaty took place over a number of years.

A．preceded
B．prescribed
C．proceeded
D．processed
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单项选择题
Living constantly in the atmosphere of slave, he became infected ______ the unconscious ______ their psychology. No one can shield himself ______ such an influence.
A．on
B．by
C．from
D．through
单项选择题
Remember to ask for a______ of quality for the consumer goods; otherwise they will not of- fer any maintenance.
A．certificate
B．mark
C．warranty
D．receipt
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