[ Grammar ]
Recently, a new vaccine against measles __________.
A. has been developed
B. had been developed
C. had developed
D. was developing
Select your answer:
Random Topics:
ConjunctionAdverb and Noun ClausesQuantifiers MixConjunctivesDefinite and Zero ArticlePerfect and Past TensesPronoun Antecedent AgreementSuffixes and TensesPossessive AdjectivesOther quiz:
Verb Tenses › ViewWhen were your parents listening to Rolling Stones?
A. When they were young
B. When they are young
C. When they will be young
D. When they have been young
Adjectives and Vocabulary › View
Which is the adjective? The woman seems worried about her sick children.
A. woman
B. seems
C. sick
D. worried, sick