I’m sure Luisa was very disappointed when she failed the exam.
A. Luisa must be very disappointed when she failed the exam.
B. Luisa must have been very disappointed when she failed the exam.
C. Luisa may be very disappointed when she failed the exam.
D. Luisa could have been very disappointed when she failed the exam.

Random Topics:
Toeic VerbSimple Future TenseArticles and QuantifiersConnectives (because, due to, owing to, because of)Grammar, Conditional Sentences, VocabularyVocabulary and Verb TensesA/AnGerunds & Infinitives + VocabularyTime PhrasesArticles and DeterminersOther quiz:
Grammar › ViewChoose the correct usage of “which”.
A. The notebook costs less, which is cheap.
B. The notebook, costs less, which is cheap.
C. The notebook which is less, which costs cheap.
Grammar › View
Which is the plural form of “country”?
A. countryies
B. countries
C. country’s
D. country
Modal Verbs › View. What does ‘may’ express?
A. Obligation
B. Ability
C. Possibility
D. Prohibition
Mixed General Quiz › View
If I had known I’d hurt him so much, I ___ that.
a. couldn’t have said
b. wouldn’t have said
