When her husband was in the army, Mary to him twice a week. A. was reading
When her husband was in the army, Mary _______ to him twice a week.
A. was reading
B. wrote
C. was written
D. had written
When her husband was in the army, Mary _______ to him twice a week.
A. was reading
B. wrote
C. was written
D. had written
Đáp án: B
Giải thích: Hành động đã xảy ra và hoàn tất trong quá khứ (Khi chống cô ấy ở trong quân đội) => quá khứ đơn
Dịch: Khi chống cô ấy ở trong quân đội, Mary viết thư cho anh ấy hai lần một tuần.