单项选择题

Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.

A．inclined to
B．subjected to
C．prone to
D．bound to
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单项选择题
After having gone ______ far along the way to his academic pursuit, Gorge did not want to give up fruitlessly.
A．that
B．such
C．much
D．enough
单项选择题
______ all our goodwill to see her through the hard time, Sarah declined politely.
A．On
B．At
C．In
D．For
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