[ Present Perfect Simple & Present Perfect Continuous ]
The scientist ___ their research yet
A. haven’t finished
B. haven’t been finished

Random Topics:
1st & 2nd ConditionalsPast Narrative TensesPresent Simple and ContinuousNouns, Pronouns, Antecedents, and Singular and PluralPresent and Past TensePassive Voice - Past SimplePast Simple TensesModal Verbs for PossibilityIntermediate GrammarPast or Present Verb TenseOther quiz:
Tenses › ViewChoose the best answer to complete the following answer:
She ___ three daughters.
A. don’t have
B. has
C. is having
Grammar › View
Which of the following is an ADVERB?
A. slowly
B. fish
C. money
Conjunctions › ViewWhich conjunction would best complete the sentence: “He studied hard, ___ he passed the exam.”
A. or
B. so
C. but
D. since
Grammar › View
If he ___________ this lottery ticket, he would’ve won a lot of money.
A. had bought
B. bought
C. has bought
D. would buy