单项选择题

Grant was one of a body of men who were self-reliant ______, who cared hardly anything for the past but had a sharp eye for the future.

A．on themselves
B．on not making a fault
C．to a fault
D．to remain ahead
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单项选择题
There have been several attempts to introduce gayer colours and styles in men's clothing, but none of them ______.
A．has caught on
B．has caught him out
C．has caught up
D．take roots
单项选择题
Huntington and many of its competitors are working to make remedial instruction a commodity as ______ and accessible as frozen yogurt.
A．ubiquitous
B．rational
C．necessary.
D．credible
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