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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

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

I have been living in the United States for twenty years, but seldom _____ so lonely as now．

I have been living in the United States for twenty years,but seldom _______ so lonely as now.

 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