[ Present Perfect Tense ]
Economics is the most interesting subject
A. Economics has been the most interesting subject
B. Economics have been the most interesting subject
C. Economics is have the most interesting subject

Random Topics:
Adjectives with -ED and -INGPresent Simple/AffirmativeConjunctions, Interjections and Sentence TypeGerund/ To Verb/ VerbGrammar ElementaryPassive Modals in Different TensesSports VocabularySimple and Continuous TensesGrammar-Present Continuous-Sentence MakingHow often - long - much - manyOther quiz:
Prepositions › ViewYou will have to wait. He will be with you _____ a minute.
A. in
B. by
C. at
Relative Pronouns › View
Is this the pizza ________ you want for dinner?
A. which
B. that
Future Tenses › ViewBy the first of December this year I ….. here for fifteen years already.
A. work
B. will be working
C. will have worked
D. will work
Tenses › View
I _____ my girlfriend for a couple of years and during that time I … many changes in her personality.
A. Have seen … have seen
B. Have seen … have been seeing
C. Have been seeing … have been seeing
D. Have been seeing … have seen