[ Mixed Tenses ]
While I _______ at the bus stop, three buses went by in the opposite direction.
A. was waiting
B. waited
C. had waited

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QuantifierAdjective vs AdverbGrammar - SimilesParticiple Clauses & Cleft SentencesPronounsSynonym and AntonymFuture TenseIf Conditional Zero and OneFamily Vocabulary and GrammarPresent Perfect Continuous TenseOther quiz:
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A. should
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