Pure sodium immediately combines with oxygen when is exposed to air.
Giải bởi Vietjack
Kiến thức: Cấu trúc câu
Giải thích:
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.
Đáp án: D
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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
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