The authorities _______ actions to stop illegal purchase of wild animals and their associated products effectively. However, they didn’t do so.
A. must have taken
B. had to take
C. needed have taken
D. should have taken
Đáp án D
Giải thích: Động từ khuyết thiếu dùng để diễn tả những khả năng xảy ra trong quá khứ.
must have taken: chắc có lẽ là had to take: phải
needed have taken: đáng lẽ ra cần should have taken: lẽ ra đã nên
Tạm dịch: Các nhà chức trách lẽ ra đã nên hành động ngay để ngăn chặn mua bán trai phép động vật hoang dã và những sản phẩm liên kết của họ.
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