Choose the correct answer to each of the following questions.
His letter is full of mistakes. He _____ the mistakes carefully before sending it.
A. must have checked
B. should have checked
C. can have checked
D. could have checked
Giải bởi Vietjack
Đáp án: B
Giải thích: should have checked: đáng lẽ ra nên kiểm tra
Dịch: Bức thư của anh ấy có rất nhiều lỗi sai. Anh ấy đáng lẽ ra nên kiểm tra các lỗi sai trong thư cẩn thận trước khi gửi nó.
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