[ Present Perfect Continuous ]
you ____/_____ sleeping for twelve hours
A. has/ been
B. have /benn
C. have/ been
D. has

Random Topics:
Articles and PronounsGrammar - Capitalization and Possessive NounsVerbs & Verb TensesPresent Simple vs Past SimpleDefinite & Indefinite Pronoun & ConditionalsActive and Passive voiceAdverbial Clause / If / ComparativesAdverbial ClausesSimple Present vs Present ProgresiveModals, Phrasal Verbs, Gerunds and InfinitivesOther quiz:
Tenses › ViewWhen John got home from work, _______________.
A. he has made a cup of coffee
B. he was making a cup of coffee
C. he makes a cup of coffee
D. he made a cup of coffee
Modal Verbs › View
You are quite late. You _________ the train.
A. may not arrive
B. might not have
C. may not get
D. might make
E. might miss
Grammar › ViewSeveral pieces of furniture _________ delivered yesterday.
A. was
B. were
C. had
D. have
Grammar › View
I ______ late today because I may have some extra work to do.
a. may not
b. may be
