单选题 You ought to do ______ he tells you.
A. where B. because C. as D. which

【正确答案】 C
【答案解析】[解析] 本题考查as的用法。本题句意为:你应该按照他说的去做。as在这里做 连词,表示他告诉你的内容。
[知识点] as的用法。as可以做副词,表示“同等地;例如”,例如:He is as tall as his father.他和父亲一样高。The children sometimes make mistakes as breaking windows.有时孩子会犯错误.如打破窗玻璃等;可以做介词, 表示“作为”,例如:He is giving orders as a commander.他作为指挥 官在发布命令;可以做连词,表示“如同;由于;结果”等,例如: He is not so smart as you described.他不像你所描述的那样聪明。I went to sleep immediately as I felt fired.因为我感觉很累,就立刻去睡了。He was so foolish as to make the mistake.他太傻才会去犯错误。