Ann was very surprised to find the door unlocked. She remembered _______it before she left.
A. to lock
B. locking
C. lock
D. she locks
Giải bởi Vietjack
remember + to V: nhớ phải làm gì (theo bổn phận)
remember + Ving: nhớ đã làm gì
Ta thấy hành động lock đã xảy ra rồi vì dựa vào vế sau của câu before she left (sau khi cô ấy đi). Vì vậy ta phải chia động từ lock ở thể locking
=>Ann was very surprised to find the door unlocked. She remembered locking it before she left.
Tạm dịch: Ann rất ngạc nhiên khi thấy cửa không khóa. Cô nhớ khóa nó trước khi đi.
Đáp án cần chọn là: B
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