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9. - BAI TAP TRAC NGHIEM TIENG ANH 12 TU BAI DE BAI 7 0476
BAI TAP TRAC NGHIEM TIENG ANH 12 TU BAI DE BAI 7 0476

9. "My uncle has been a writer for many years. " - "How many books _______ so far?"

A. did he write B. has he been writing C. had he written D. was he writing