He focused his effort ____the house ___sale for fear that the prices of them would go up suddenly.A.on; forB.on; inC.to; forD.to; in
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A解析试题分析：考查固定词组。固定词组focus…on…聚焦于…；for sale出售；句意：他很注意出售的房屋的价格，唯恐房价突然上升。故A正确。考点：考查固定词组点评：固定词组focus…on…聚焦于…；for sale出售；