She has been writing to him since she _______ his email.
She has been writing to him since she _______ his email.
A. will have
B. is having
C. had
D. has
C
Kiến thức: Sự hòa hợp thì
Giải thích:
HTHT/HTHTTD + since + QKĐ
Dịch nghĩa: Cô ấy đã viết thư cho anh ấy kể từ khi có được email của anh ấy.