[ Grammar ]
Recently, a new vaccine against measles __________.
A. has been developed
B. had been developed
C. had developed
D. was developing

Random Topics:
will, be going to, would like toTenses and ArticleArticle the or zero article (-)Prepotitions-ing form and the to-infinitiveInversion + Passive VoiceClausePast Perfect & Past SimpleSubject Verb Agreement & Subjunctive MoodReflexive Pronouns & Modal VerbsOther quiz:
Tenses › ViewHis dad comes to pick him up in the afternoon.
A. Present Simple Tense
B. Present Continuous Tense
C. Simple Past Tense
D. Past Continuous Tense
Type of Sentences › View
How many students are in your class _
A. . Declarative
B. . Imperative
C. ? Interrogative
D. ! Exclamatory
Have you finished your work _____________?
A. already
B. just
C. yet
Modals › View
——- we have lunch in that restaurant?
A. will
B. shall
C. may
D. could
E. must
