单项选择题

Doctors' efforts to develop a new way to see the brain working have so far ______ with satisfaction.

A．found
B．shown
C．given
D．met
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单项选择题
Students are not allowed to ______ for the final exam if they have missed one third of the classes.
A．make
B．sit
C．offer
D．go
单项选择题
His parents never intended ______ together with him though they hoped to see him often.
A．live
B．living
C．to have lived
D．to be living
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