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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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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