If the appliance is defective, write directly to the manufacturer______complain to your local consumer protection association.

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问题 If the appliance is defective, write directly to the manufacturer______complain to your local consumer protection association.

选项 A、then
B、or
C、but
D、though

答案B

解析 考查连词用法。句意为“如果这个设备有缺陷,可以直接写信给制造商______向当地的消费者保护协会投诉”。根据句子逻辑及句意,要用表示选择关系的连词or,故选B。
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