单项选择题

Dr. Wang has made much contribution to the theories of modem physics at the ______ of his health.

A．cost
B．disposal
C．mercy
D．expenditure
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单项选择题
Up until that time, his interest had focused almost ______ on fully mastering the skills and techniques of his craft.
A．restrictively
B．radically
C．inclusively
D．exclusively
单项选择题
One is not guilty until he ______.
A．has proved
B．has been proved
C．is proved
D．will be proved
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