The scientists succeeded in finding a vaccine for that disease.
A. The scientists were able to find a vaccine for that disease.
B. The scientists were finding a vaccine for that disease.
C. The scientists should have found a vaccine for that disease.
D. The scientists couldn’t find a vaccine for that disease.
Đáp án đúng: A
Dịch: Các nhà khoa học đã có thể tìm được vắc xin cho bệnh này.
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After fighting the fire for 12 hours, the firemen succeeded in putting it out.
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