"Could Tom have been at home yesterday?" - "He … really don't know." A. could have been
"Could Tom have been at home yesterday?" - "He … really don't know."
A. could have been
B. had to have been
C. might be
D. couldn't have
"Could Tom have been at home yesterday?" - "He … really don't know."
A. could have been
B. had to have been
C. might be
Đáp án: A
Giải thích: diễn tả dự đoán có thể xảy ra trong quá khứ dùng could have + VpII
Dịch: "Tom có thể đã ở nhà ngày hôm qua?" - "Anh ấy có thể đã thực sự không biết."