---I must be leaving now. It'll be three hours' drive to get there.---______.A.Good-bye.B.Take care.C.Take it easy.D.What can I do for you?
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B解析从语境意义去分析可知，上句为“将花三个小时到达那里”，指离别后要做某事，而且时间紧，有一定的危险性，故答句用Take care.意在提醒对方要“小心谨慎些”。C项“放松点”，它具有to rest; to do only light work之意，用在此处不妥。