问题
选择题
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
答案：A
A 考查倒装和时态。句意：我在美国生活了20年，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。