问题
选择题
My parents live in a small village. They always keep candles in the house_____there is a power out.
A．if
B．unless
C．in case
D．so that
答案
C。
他们在屋内时刻备有蜡烛是停电的时候用的，因此该空应填in case引导目的状语从句。
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