题文
My parents live in a small village. They always keep a lot of candles in their house _______ there is a power out.
| A．if | B．unless | C．in case | D．so that |
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My parents live in a small village. They always keep a lot of candles in their house _______ there is a power out.
| A．if | B．unless | C．in case | D．so that |
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