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

For instance, the public may not fully understand the physical principles behind lasers, but it clearly can appreciate the extraordinary medical benefits ______ this technology.

A．as a result of
B．that result in
C．the result of which is in
D．resulting from

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