[ Vocabulary and Grammar ]
The Thang Long Imperial Citadel was the __________ of political power for nearly seven centuries without interruption.
A. middle
B. point
C. system
D. centre

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Sentence Structure and Pronoun AntecedentArticles with SubstancesAuxiliary Verbs, if, unless and ModalSynonymModals for Advice, Obligation/Prohibition, Necessity and Lack of NecessityObject PronounPresent Simple vs Past SimpleCan vs be able toMay, MightRequest with Modal VerbsOther quiz:
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He ____________________at the top of the mountain right now .
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