The scientists ___________ important research in the laboratory.
Đáp án đúng là: D. carry out
Giải thích:
Cụm động từ 'carry out' có nghĩa là thực hiện, tiến hành một công việc gì đó, thường là nghiên cứu, thí nghiệm, hoặc nhiệm vụ. Các lựa chọn khác không phù hợp với ngữ cảnh này.
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