_____________ DID YOU BUY THIS BOOK

DE THI HOC KY 2 MON TIENG ANH LOP 10 TRUONG THPT TRAN HUNG DAO TP HO CHI MINH NAM HOC 2016 2017 CO DAP AN

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19. _____________ did you buy this book? -I bought it yesterday.

A. Why B. Who C. What D. When