Luisa was very disappointed when she failed the exam. I'm sure about that

50/50

Luisa was very disappointed when she failed the exam. I'm sure about that.

Luisa must be very disappointed when she failed the exam.

Luisa must have been very disappointed when she failed the exam.

Luisa could have been very disappointed when she failed the exam.

Luisa may be very disappointed when she failed the exam.

Giải thích

Đáp án B

Kiến thức: ngữ pháp

Dùng must have done sth: chắc hẳn đã làm gì (phỏng đoán chắc chắn về việc đã xảy ra trong quá khứ)

Tạm dịch: Tôi chắc rằng Luisa đã rất thất vọng khi cô ấy trượt kỳ thi.

→ Luisa chắc hẳn đã rất thất vọng khi cô trượt kỳ thi.