I have been living in the United States
问题:
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
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