He looked as if he   （）      ill for a long time.

题目解析 题目：He looked as if he （） ill for a long time. A. was B. were C. has been D. had been 答案: D 解析: 这是一个过去完成时的虚拟语气。"as if"后面的从句表示与现实相反的假设，用于描述过去某一时刻的情况。"He had been ill for a long time" 表示他过去已经生病了很长时间。因此，正确答案是D选项 "had been"。