The palace is heavily guarded, because inside its walls .A. where sit the European leaders

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A. where sit the European leaders
B. the European leaders there sit
C. sit the European leaders
D. that the European leaders sit
解析：考查倒装句。表示地点的介词短语放在句首，且句子的主语为名词时使用全部倒装。句意：这宫殿被重兵保护，因为里面住着欧洲领导人。