单项选择题

Noise, in the technical sense, implies a random chaotic disturbance ______.

A．usually does not want
B．that one does not usually want it
C．usually is unwanted
D．that is usually unwanted
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单项选择题
Foreign disinvestment and the ______ of South Africa from world capital markets after 1985 further weakened its economy.
A．displacement
B．elimination
C．exclusion
D．exception
单项选择题
They are unwilling ______ their pictures hung in the corridor.
A．as we to have
B．as we have
C．as us to
D．as have we
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