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Câu hỏi:
US scientists claim that they _______ a new vaccine against malaria.
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A.
developed
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B.
have developed
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C.
had developed
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D.
was developing
Lời giải tham khảo:
Đáp án đúng: B
Hãy trả lời câu hỏi trước khi xem đáp án và lời giải -
A.
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
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