A. Some students took part in directing the traffic, so some others took care of the war invalids.
B. Some students took part in directing the traffic, for some others took care of the to war invalids.
C. Some students took part in directing the traffic, and some others took care of the war invalids.
D. Some students took part in directing the traffic, but some others took care of the war invalids.
Đáp án đúng là: C
Dịch: Một số học sinh tham gia chỉ đạo giao thông. Những người khác đã chăm sóc các thương binh.
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