My parents live in a small village. They always keep some candles in the house __________ there is a power off.
| A．if | B．unless |
| C．in case | D．so that |
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My parents live in a small village. They always keep some candles in the house __________ there is a power off.
| A．if | B．unless |
| C．in case | D．so that |
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