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
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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
单项选择题
The once separate issue of environment and development are now ______ linked.
A．intangible
B．indispensable
C．inextricably
D．incredibly
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