could you please look after my dog___ i am away? A. when B. while C. if 选哪个,请给出分析,谢谢

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could you please look after my dog___ i am away? A. when B. while C. if 选哪个,请给出分析,谢谢

B.while表示一个时间段.当我外出时您能照看一下我的狗吗

B. be away 是一个状态，while 后面接状态

选B，此题若选C则要用虚拟语气，而be动词决定是while而不是when

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