The letter that I received yesterday is from my sister4/30The letter that I received yesterday is from my sister.I was received that the letter is from my sister.The letter that was received yesterday is from my sister.The letter yesterday that is from my sister is received by me.I received yesterday that the letter is from my sister.Giải thíchChọn đáp án B Giải thích : mệnh đề quan hệ thay thế cho danh từ chỉ vật