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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.
Câu hỏi:Pure sodium immediately combines with oxygen when is exposed to air.
- A. combines
- B. to air
- C. is exposed
- D. immediately
Lời giải tham khảo:
Đáp án đúng: C
Với các mệnh đề chứa liên từ thời gian ( when, after, before, while,…) mang nghĩa bị động thì có thể rút gọn câu bằng cách bỏ chủ ngữ và chuyển động từ sang dạng quá khứ phân từ ( P2).
Chú ý: chỉ áp dụng với 2 mệnh đề cùng chủ ngữ
is exposed => exposed
Tạm dịch: Natri tinh khiết ngay lập tức kết hợp với oxy khi tiếp xúc với không khí.
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