单选题 We can't _____________ the possibility that Mary was murdered by her husband.

【正确答案】 C
【答案解析】我们不能排除Mary被她丈夫谋杀的可能性。短语run out 意为“用光”；drop out“不参与，离去，放弃”；rule out“排除，取消”；hand out“分发，施舍”。