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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
When he was a little boy, Mark Twain ____________ along piers, watch the river boats, and swim in the Mississippi, much like his famous character, Tom Sawyer.
A. walked
B. used to walking
C. used to walk
D. walk
When he was a little boy, Mark Twain ____________ along piers, watch the river boats, and swim in the Mississippi, much like his famous character, Tom Sawyer.
A. walked
B. used to walking
C. used to walk
D. walk
Used to do sth: được dùng để diễn tả hành động đã từng xảy ra trong quá khứ
Đáp án C.