Bộ 20 đề luyện thi Chuyên Anh năm 2023 có đáp án (Đề 96)

On the other hand, current research has not yet (64) clear adverse effect associated with the prolonged use of mobile phones. A. proved   B. created      C. demonstrated   D. caused

64/80

On the other hand, current research has not yet (64) _______ clear adverse effect associated with the prolonged use of mobile phones.

proved

created

demonstrated

caused

Giải thích

Đáp án: A