[ 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:
Tenses › ViewShe ____ her homework by the time you arrive.
A. will finish
B. will have finished
C. finishes
D. finished
E. finishing
Science › View
The Kalahari desert is in:
A. India
B. Chile
C. Australia
D. Botswana
Barney 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
