Đề kiểm tra học kì 2 Tiếng anh 12 năm 2023 có đáp án (Đề 15)

French scientists have revealed that the coronavirus in Europe as early as November last year

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French scientists have revealed that the coronavirus _____ in Europe as early as November last year.

can be

may be

may have been

had to be

Giải thích

Đáp án C