单项选择题

Telecommuting, ______ the computer for the trip to the job, has been hailed as a solution to all kinds of problems related to office work.

A．substitutes
B．substitution of
C．substituting
D．to substitute for
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单项选择题
Aside from perpetuating itself, the sole purpose of the American Academy and Institute of Arts and Letters is to foster, assist and sustain an interest in literature, music, and art.
A．grow
B．promote
C．maintain
D．survive
单项选择题
People in the United States in the nineteenth century were haunted by the prospect that unprecedented change in the nation' s economy would bring about social chaos.
A．occupied
B．overwhelmed
C．obliged
D．obsessed
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