[ Grammar ]
You look tired. How long ……… (you / work) on your AI project?
A. have you worked
B. have you been working
C. are you working

Random Topics:
Grammar: AgreementFirst ConditionalModals for DeductionDefinite and Indefinite ArticlesQuantifiers & Modals of ObligationKinds of SentencesAdjective vs AdverbIdentify The TensesVerbs + Infinitives / GerundsComparative and Superlative AdjectiveOther quiz:
Grammar › ViewIf we had read the book, we …… the film
A. understand
B. will understand
C. would undestand
D. would have understood
If Conditional › View
If you ______ leave now, I _____ the police.
A. don’t / call
B. won’t / call
C. don’t / ‘ll call
Grammar & Vocabulary › ViewJason: Did you _____ a good time last Saturday? Max: Yes, I ____!
A. have /didn’t
B. do/did
C. make/ did’t
D. have / did
Simple Past Tense › View
My sister ________ ___________ (not, clean) her room last week.
A. didn’t/clean
B. didn’t/cleaned
C. did/ cleaned
D. don’t/clean
