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Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
While the teacher was explaining the sum on the blackboard, the children threw paper aeroplanes around the classroom.
- A. was explaining
- B. on the
- C. threw
- D. around
trả lời câu hỏi trước khi xem đáp án bên dướiQUẢNG CÁOCâu 1 Đáp án đúng: C
Đáp án đúng là C: threw ⇒ were throwing
Câu này diễn tả 2 hành động đang xảy ra cùng lúc ở 1 thời điểm trong quá khứ (dựa vào từ 'while') nên cả 2 động từ ở 2 mệnh đề phải chia thì quá khứ tiếp diễn.
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