问题补充:
I have been living in the United States for twenty years, but seldom so lonely as now.
A. have I felt
B. I had felt
C. I have felt
D. had I felt
答案:
(答案→)A. have I felt
B. I had felt
C. I have felt
D. had I felt
解析:本题考查倒装结构。句中否定词seldom放在句首,故用倒装结构,根据时态用现在完成时。句意:我在美国生活了了,但我很少像现在一样孤独。