[ Grammar ]
These scientists _____ cultural assimilation in some countries around the world for more than 20 years now.
A. has studied
B. has been studying
C. have studied
D. have been studying
Select your answer:
Random Topics:
Prepositions and Phrasal VerbsAdverb & Compound SentencesAdverb Of PlaceFigurative Language VocabularyGrammar: AgreementTenses - AuxiliariesPhrasal Verbs with up and downDependent PrepositionClauses and GerundsOther quiz:
Modal Verbs › ViewHe _________ wake up early. He is a postman.
A. can
B. mustn’t
C. doesn’t have to
D. has to
Tenses - Present and Past › View
Look! The concert__________ (start) at 7 P.M. and__________ (end) at 9 P.M.
A. will start – will end
B. starts – ends
C. is starting – ends
D. starts – is ending