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They ______________ when somebody rang the bell (to study)
A. were studing
B. was studying
C. were studying

Random Topics:
take, make, doConjunctions and Sequence ConnectorsNounsPast and Present Continuous tensePast Perfect Simple & ContinuousMixed ConditionalCollective NounsTenses and ComparisonsComplex Sentences with Adverb ClausesSentence StructureOther quiz:
Mixed General Quiz › ViewMore ___ 20 ethnic groups live in DeKalb County (near Atlanta), which has the highest concentration of Asian businesses in the southeastern U.S.
a. them
b. then
c. than
Past Tense › View
the bus came after I …. for forty minutes
A. have been waiting
B. had been waiting
C. was waiting
D. am waiting
Modal Verbs › ViewWe ____________ forget to bring our passports to the airport.
A. can’t
B. shouldn’t
C. must
Conjunction › View
Claire welcomed his guests ______ offered them drinks.
A. And
B. While
C. Until
D. As