(2013·甘肃兰州名校高三检测)I have been living in the United States for 20 years, but seldo

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(2013·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

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