单选题 By ______ computation, he estimated that the repairs on the house would cost him $2,000.
A. coarse B. rude C. crude D. rough

【正确答案】 D
【答案解析】[解析] by rough computation粗略计算；coarse粗糙的，粗鄙的；rude粗鲁的；crude天然的，未加工的，拙劣的。