After driving for twenty miles, he suddenly realized that he has been driving in the wrong direction.
Giải bởi Vietjack
Kiến thức: Thì quá khứ hoàn thành tiếp diễn
Giải thích:
Sự việc "realized" xảy ra sau sự việc "drive" nên động từ "drive" không thể chia ở thì hiện tại hoàn thành tiếp diễn mà phải chia ở quá khứ hoàn thành tiếp diễn.
has been driving => had been driving
Tạm dịch: Sau khi lái 20 dặm, anh ấy đột nhiên nhận ra rằng anh ấy đã lái xa sai hướng.
Đáp án: C
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