单项选择题

Silver is the best conductor of electricity, copper (follow)______it closely.
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(see)______from the top of the tower at night, the city looks more beautiful.
(see)______from the top of the tower at night, the city looks more beautiful.
单项选择题
Under no circumstances ______anything that will benefit ourselves but harm the interests of the state.
A．we should do
B．should we do
C．we did
D．did we do
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