(·甘肃兰州名校高三检测)I have been living in the United States for 20 years but seldom so lone

问题补充：

(·甘肃兰州名校高三检测)I have been living in the United States for 20 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：

A. have I felt

B. I had felt

C. I have felt

D. had I felt

解析：A考查倒装和时态。句意：我在美国生活了，但是很少像现在这样感到如此孤独。否定词seldom置于句首，句子要用部分倒装，再根据前面的“have been living”可知此处应用现在完成时。故选A项。