单项选择题

To some extent, the principle of secrecy has been ______.

A．maintained
B．held
C．observed
D．implemented
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单项选择题
He could hardly ______ his temper and he flew in a rage.
A．hold on
B．hold onto
C．hold up
D．hold in
单项选择题
Up ______ when the country declared war on its neighboring country.
A．the oil prices went
B．went the oil prices
C．did the oil prices go
D．would the oil prices go
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