单项选择题

I have no doubt ______ he will overcome all his difficulties.

A．whether
B．when
C．that
D．if
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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
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
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