单项选择题

The people in the snow-stricken areas need much more food than ______to them by the airforce.

A．being delivered
B．have been delivered
C．delivered
D．has been delivered
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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
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
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