by When/ we/ go/ back/ the bookstore, we/ buy/ book/ we/ wanted.
A. When we go back to the bookstore, we will buy the book we wanted.
B. When we will go back to the bookstore, we buy the book we wanted.
C. When we go back to the bookstore, we buy the book we wanted.
D. When we will go back to the bookstore, we will buy the book we wanted.
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Đáp án: A
Giải thích: cấu trúc “when S + V(s/es), S will V”
Dịch: Khi chúng tôi quay lại hiệu sách, chúng tôi sẽ mua quyển sách chúng tôi muốn.
