[ Grammar ]
I am tired because I ………..
A. worked all day
B. have been working all day
C. have worked all day
D. had been working all day

Random Topics:
Phrasal VerbPast Tense vs Future TenseFuture Perfect TenseFuture Tense (will/be going to/p.continuous)To Infinitive/Bare Infinitive/GerundsNouns & PronounsPast Simple and Past ProgressivePassive Voice - Past SimplePersonal PronounModal Auxiliary VerbsOther quiz:
Grammar › Viewmy younger sister has (105) colorful paper.
A. one hundred and five
B. one hundred and fifty
C. one hundred and fifteen
D. one hundred and thirteen
Past Tenses › View
I _______ from university in 2015.
A. graduated
B. was graduating
C. had graduated
D. had been graduating
Grammar › ViewWe are very surprised to ________ Peter at the party.
A. seeing
B. see
C. saw
D. sees
Grammar › View
She is
A. ugly
B. small
C. thin