Announcements were made by deans and officials, and identifications were verified by proctors, who then handed out the exams.
A. Correct.
B. Deans and officials made announcements, and the proctors verified identifications and handed out the exams.
C. Announcements were made by deans and officials before the proctors verified identifications and handed out the exams.

Random Topics:
Verb Tense, Pronouns and AntecedentsWish + Verb 2Basic TensesOffer and SuggestionTenses PracticeGrammar - Present and Past PassivePast ModalsSpellingReporting VerbsFuture Tense and ConditionalsOther quiz:
Grammar › View_____ the letter ?
A. Have your dad written
B. Have your dad wrote
C. Has your dad written
D. Has your dad wrote
Modal Verbs › View
James ………… go on holiday to Italy; he hasn’t made up his mind yet.
A. might
B. ought to
C. should
Gerund or Infinitive › ViewI really like … in the rain, do you?
A. walk
B. walking
C. walks
Conjunction › View
Choose the correct pair of correlative conjunctions.
The boy is _____ mean _____ unkind, in fact he is a friend to everybody.
A. both/and
B. neither/nor
C. whether/or
D. either/or