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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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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