单项选择题

Only under special circumstances ______ to take make-up tests.

A．freshman are permitted
B．are freshman permitted
C．permitted are freshman
D．are permitted freshman
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单项选择题
Probability is the mathematical study of the ______ of an event's occurrence.
A．predictability
B．possibility
C．feasibility
D．undeniability
单项选择题
The new arrival was ______ the famous scientist.
A．none but
B．nothing but
C．none other than
D．nothing other than
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