Choose the best answer.
My friend _______ me for what I had done for him.
A. has thanked
B. thanked
C. thanks
D. is thanking
Hành động xảy ra trước chia ở thì quá khứ hoàn thành.
Hành động xảy ra sau chia ở thì quá khứ đơn.
Công thức: S + Ved/V2………., S + had + Ved/V3
=>My friend thanked me for what I had done for him.
Tạm dịch: Bạn tôi cảm ơn tôi vì những gì tôi đã làm cho bạn ấy.
Đáp án cần chọn là: B
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