Đề thi thử tốt nghiệp THPT Quốc Gia môn Tiếng Anh tỉnh Tuyên Quang năm 2023 (lần 1)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

She has been writing to him since she _____ his email.