[ Tenses ]
The students ______ attentively to the lecturer when a phone rang.
A. listen
B. are listening
C. have listened
D. were listening

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Grammar - much, many, a lot ofInterrogative PronounsCommon ErrorApostrophe GrammarCohesive DevicesPast Perfect SimpleCountable & Noncountable NounsPossessive Nouns with Apostrophes and PronounsFrequency AdverbsSecond Type ConditionalOther quiz:
Grammar for TOEFL › ViewThe great digital advances of the electronic age, such as integrated circuitry and a microcomputer, has been planted in tiny chips.
A. great digital
B. circuitry
C. has
D. planted
Grammar › View
Make a list of countries _____ population is greater than 20 million.
A. that
B. whose
C. which
D. who