[ 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:
Present Perfect Tense › ViewHave 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