这道题怎么做:I have been living i
IhavebeenlivingintheUnitedStatesfortwentyyears,butseldom___solonelyasnow.[]A.haveIfel...
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
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