[ Modal Verbs ]
I’m sure he knew all about the secret because he was there when we were talking
A. He must be knowing all about the secret because he was there when we were talking.
B. He should have known all about the secret because he was there when we were talking
C. He must have known all about the secret because he was there when we were talking.
D. He might have known all about the secret because he was there when we were talking.

Random Topics:
Sentences vs Run-OnsPhrasesPreposition & GerundVerb TensesIntensifiers: Really vs VeryGrammar - Collective NounsPast Tense and Perfect TensePassive Voice & TensesVerb Tenses and Sentence StructureAdjective and AdverbOther quiz:
Present Perfect Continuous › View_______ your grandmother _________ a great time?
A. ARE / PLAYING
B. IS / HAVING
C. IS / DOING
Has and Have › View
He ……a new watch
A. has
B. have
Homonyms › ViewBarney dances every night at the ___.
a. review
b. revue
Grammar › View
The dish……….I ordered was delicious.
A. where
B. why
C. that
D. who
