Đáp án B
Trạng từ “up to now” là dấu hiệu của thì HTHT → chọn B
Dịch: Họ vẫn chưa hoàn thành dịch vụ của mình cho đến tận bây giờ
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Đọc tiếp
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
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A. didn’t do
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