Be careful when using electrical ______________.
Đáp án đúng là: A. equipment
Giải thích:
Câu này yêu cầu một danh từ để chỉ các thiết bị hoặc máy móc sử dụng điện. 'Equipment' có nghĩa là trang thiết bị, máy móc. Các từ còn lại có nghĩa khác: 'experiment' (thí nghiệm), 'experience' (kinh nghiệm), 'exception' (ngoại lệ).
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