单项选择题

______before we leave tomorrow, we should invite all our friends to hold a party to welcome them.

A．Had they come back
B．Were they coming back
C．Were they ti5 come back
D．Would they come back
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单项选择题
Electrical appliance such as toasters or hair dryers are designed to ______the ability of an electric current to heat a wire.
A．take the risk of
B．take advantage of
C．take responsibility of
D．make sense of
单项选择题
Since 1945, the rivalry in military strength between the world's great powers has produced a balanced peace.
A．contemporarily
B．predictably
C．temporarily
D．previously
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