I'm sure Luisa was very disappointed when she failed the exam. A. Luisa could have been

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Mark‌ ‌the‌ ‌letter‌ ‌A,‌ ‌B,‌ ‌C,‌ ‌or‌ ‌D‌ ‌on‌ ‌your‌ ‌answer‌ ‌sheet‌ ‌to‌ ‌indicate‌ ‌the‌ ‌sentence‌ ‌that‌ ‌is‌ ‌closest‌ ‌in‌ ‌meaning to‌ ‌each‌ ‌of‌ ‌the‌ ‌following‌ ‌questions. ‌ ‌

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

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

‌ ‌‌Luisa‌ ‌must‌ ‌be‌ ‌very‌ ‌disappointed‌ ‌when‌ ‌she‌ ‌failed‌ ‌the‌ ‌exam. ‌ ‌

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

‌ ‌‌Luisa‌ ‌may‌ ‌he‌ ‌very‌ ‌disappointed‌ ‌when‌ ‌she‌ ‌failed‌ ‌the‌ ‌exam. ‌ ‌

Giải thích

Đáp án đúng: C

Giải thích: must have + V(II) = chắc hẳn đã ... => dự đoán về một sự việc đã xảy ra trong quá khứ.

Dịch: Luisa chắc hẳn đã rất thất vọng khi cô ấy trượt kì thi.