填空题 Nobody knows for sure how much these free official banquets have cost the people, but it must have reached on 1figure.(astronomy)
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【正确答案】 1、正确答案：astronomical    
【答案解析】解析：(句意：没人知道免费的公务宴请已经花费了多少钱，但这个数一定是个天文数字。此处应填一个形容词来修饰figure。an astronomical figure为固定搭配，表示“天文数字”。)