单项选择题

Once the novelty of watching TV and videos all day has ______, there is nothing to do.

A．worn away
B．worn down
C．worn off
D．worn out
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单项选择题
Even though the Italian authorities may no longer ______ any old bank that gets into trouble, the likelihood of government support for big banks has not changed enough to affect its ratings.
A．bail out
B．draw out
C．hang out
D．knock out
单项选择题
One of the roles which science plays is that of ______ superstition.
A．cover up
B．casting out
C．building up
D．fence off
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