[ Tenses ]
. They have been studying for three hours.
A. Present Perfect Tense
B. Present Perfect Continuous Tense
C. Past Continuous Tense
D. Future Perfect Tense

Random Topics:
Sentence CompletionPast, Present, FuturePresent Perfect vs Past Simple TenseGrammar - Capitalization and Possessive NounsArticles with SubstancesPassive Voice and ModalsPossessive Nouns with Apostrophes and PronounsPresent Perfect Tense and Simple Past Tenseanother/the others/each other/one anotherPast Simple - Present PerfectOther quiz:
Indefinite Pronoun › ViewWhy are you looking at me so angrily? I didn’t do ________wrong.
A. Anything
B. Nothing
C. Everything
Grammar › View
Choose the correct alternative.
The Lord of the rings ________ by J.R.R. Tolkien.
#
A. was write
B. was wrote
C. was written
D. was writed
Tenses › ViewWhich sentence is grammatically correct?
A. I wish I was taller.
B. I wish I were taller.
C. I wish I am taller.
D. I wish I had been taller.
Quantifier › View
Buy ___________ bread and cheese for the picnic if you want to help.
A. some
B. any
C. many
D. much
