We have been working on this project for three weeks.
A. Present Perfect Simple
B. Past Perfect Simple
C. Future Perfect Simple
D. Present Perfect Continuous
E. Past Perfect Continuous

Random Topics:
Simple Present TenseVerbs and Possessive AdjectiveArticles and DemonstrativesPresent TenseNoun, Quantifiers and SuffixesPrepositions and ConjunctionsPast Continuous Tense & Past ModalsSentencesPrepositions and Adverbs�Put� Phrasal VerbOther quiz:
Tenses › ViewWhich sentence is in past continuous tense?
A. She is reading a book every night
B. They were playing in the garden
C. He will cook dinner just now
D. We went for a walk yesterday
Verb Tenses › View
Use the present perfect tense to describe a recent trip.
A. I visited Paris last summer.
B. I will visit Paris next year.
C. I have visited Paris and explored its famous landmarks.
D. I am visiting Paris right now.
General Knowledge › ViewMineral that enables blood to carry oxygen.
A. Calcium
B. Potassium
C. Iron
D. Magnesium
Past Tenses › View
She _______ (studied/had studied) for two hours before she _______ (watched/had watched) her favorite show.
A. studied/had watched
B. had studied/watched
C. Studies/had watched
D. Studied/watched