[ 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:
Question Tag › ViewA:Let’s go to the movies tonight, __?
B:That sounds great.
A. do we
B. do you
C. shall we
D. shall you
Grammar › View
You ___ cook dinner tonight because we’re going to eat out.
A. mustn’t
B. needn’t
C. can’t
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
