Chọn câu đúng nhất ứng với A (hoặc B, C, D) từ những từ gợi ý
the harm of smoking/ question/ not/ entirely settled.
A.The harm of smoking is a question that has not entirely been settled.
B.The harm of smoking have questions that entirely not been settled.
C.The harm of smoking is a question that has not entirely settled.
D.The harm of smoking being a question that has not entirely been settled.

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