The mother is very _____ about the health of her little son.
Đáp án A
Concerned about something: lo lắng cho điều gì
Careful: cẩn thận
Nervous: lo lắng
Confused: lúng túng
Tạm dịch: Bà mẹ ấy rất lo lắng cho sức khoẻ của đứa con nhỏ
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