单项选择题

Mr. Scott asked for an assistant because his work load was too ______.

A．preoccupied
B．onerous
C．trifling
D．omnipresent
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单项选择题
Strict sanitary procedures formulated by our municipal government help to ______ out-breaks of diseases.
A．preview
B．forestall
C．ignite
D．fluctuate
单项选择题
Because a circle has no beginning or end, the wedding ring is a symbol of ______ love.
A．extravagant
B．prominent
C．prescient
D．eternal
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