She _______ blood twenty times so far.
A. donates
B. donated
C. has donated
D. is donating
so far: cho đến bây giờ (dấu hiệu thời gian cho thời HTHT)
Chủ ngữ “she” số ít => động từ chia kiểu “has + V phân từ II)
=> has donated
=> She has donated blood twenty times so far.
Tạm dịch: Cho đến bây giờ cô ấy đã hiến máu 20 lần
Đáp án cần chọn là: C
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