When I met Walters about two years before his death he didn't seem satisfied.
He no major book since he settled in Uga?
When I met Walters about two years before his death he didn't seem satisfied.
He ____ no major book since he settled in Uganda.
He ____ no major book since he settled in Uganda.
A. has published
B. could have published
C. published
D. had published
Đáp án D
Ta có cấu trúc: Trước since chia hiện tại hoàn thành sau since chia quá khứ đơn. Tuy nhiên, căn cứ vào các động từ "met", "didn't seem" và quy tắc về sự phối thì nên ta chia động từ trong vị trí trống ở thì quá khứ hoàn thành.
