People living in the area where there is
题型：选择题
问题：
People living in the area where there is a lack of electricity often keep a supply of candles ________power failure.
A．in case of
B．once
C．even if
D．in course of
People living in the area where there is a lack of electricity often keep a supply of candles ________power failure.
A．in case of
B．once
C．even if
D．in course of