They ______ for half an hour before the teacher arrived.
A. had been studying
B. worked
C. had worked

Random Topics:
Wish SentencesVocabulary and IdiomsCoordinate ConjunctionVerb Forms and Prepositionsgoing toAdjective or Adverb1st and 2nd ConditionalsPast Simple Negative & QuestionsConjunctionRelative PronounsOther quiz:
Conditional Sentences and Verb Form › ViewIf I learnt Belarusian, I would read a Belarusian book.
A. I were learning to Belarusian, I could read a Belarusian book.
B. Were I to learn Belarusian, I would read a Belarusian book.
C. Were I learning to Belarusian, I would have read a Belarusian book.
D. Had I learnt Belarusian, I would have read a Belarusian book.
Quantifies and Modals of Deduction › View
We can get there early, but there are ______ tour guides before 10AM, so we would have to wait.
A. any
B. some
C. none
D. no
Grammar and vocabulary › Viewboring, without life, excitement or colour
_____ afternoon/people/colour/weather
A. sweeping
B. gruelling
C. dreary
D. dull
Narrative Tenses › View
I knew he _____ because his eyes were red.
A. cried
B. was crying
C. had cried
D. had been crying
