My friend (thank) me for what I had done for him.
A. thanks
B. thanked
C. have thanked
Đáp án: B
Giải thích: Hành động xảy ra trước chia ở thì quá khứ hoàn thành, hành động xảy ra sau chia ở thì quá khứ đơn.
Dịch: Bạn tôi cảm ơn tôi vì những gì tôi đã làm cho bạn ấy.
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