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
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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
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

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