[ Modal Verbs ]
They __________ known about the event if they had checked their emails.
A. must have known
B. could have know
C. could have known
D. must have knew

Random Topics:
Simple Future - WillQuestion WordsGrammar PhrasesPerfect TensePresent Forms and Narrative TensesActive vs. Passive VoicePresent Simple and Present ContinuousVerb AgreementAdverbial Clause of MannerPrepositionsOther quiz:
Grammar › ViewI bought a car ( who – which – where ) is very fast.
A. who
B. which
C. where
Vocabulary › View
I was so nervous during the competition and could feel myself start to ______.
A. attraction
B. perspire
C. stroller
Conjunctions › ViewDo you want to eat pasta ___________ rice for dinner?
A. and
B. but
C. because
D. or
Vocabulary › View
He is a faithful friend, and always support me when things go wrong
A. Ambitious
B. Care
C. Loyal
D. Sociable
