_______checks for maintenance are performed regularly, you are not assured of reliable, quality service.

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问题 _______checks for maintenance are performed regularly, you are not assured of reliable, quality service.

选项 A、whereas
B、in case
C、as long as
D、unless

答案D

解析 所有选项都是引导状语从句的连词。这时就应该通过分析词义来解题。句中说,如果检查与维修不定期进行,那么就不能保证良好的服务。whereas表示“反之”,in case是“免得”,as long as是“只要”,unless是“除非”(if…not,或except that…)。
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