[ Grammar ]
I visited the theatre ________ Mozart performed many of his opera.
A. which
B. when
C. where
D. who

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Sentence StructurePresent Simple ProgressiveQuantifiers & Modals of ObligationApostrophe GrammarGrammar (want to/ need to/ have to)Wish clauseCountable & Uncountable NounsGerunds as objects of prepositionCountable QuantifiersPast Perfect and Past Perfect Continuous TenseOther quiz:
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A-Shall have been working
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The service center ____ vehicles right now, during the busiest hour.
A. is repairing
B. repaired
C. repairs
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