[ Verb Tenses ]
_____ with Dr. Browne since your project in 2018?
A. Do you collaborate
B. Had you collaborated
C. Have you collaborated
D. Are you collaborating

Random Topics:
Verbs and PrepositionsConjunctive AdverbsComplex Sentences with Adverb ClausesConjunctions, Interjections and DeterminersGrammar, adverbs of frequency placementPresent Progressive (Future)Verb FormComparatives, Superlatives & EquativesBasic GrammarTOEIC Grammar and Vocabulary ReviewOther quiz:
Grammar › ViewAt the moment, they _____ in a meeting with the manager.
A. are
B. is
C. was
D. be
Future Tenses, Conditionals and Professions › View
Who prepares delicious meals in restaurants?
A. Lawyer
B. Chef
C. Electrician
D. Dentist
Present Perfect vs Past Simple › ViewI haven’t seen my parents _____ last Christmas.
A. already
B. before
C. for
D. since
Prepositions › View
The children walked __ the park to get home quickly.
A. For
B. Through
C. By
