It is extremely hot this summer. , many people say it has been the hottest in the past 30

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A. Frequently
B. Actually
C. Fluently
D. Gradually
解析：副词词义辨识。frequently: often, 经常。actually: in fact, 事实上、实际上。fluently: 流利地。gradually: 渐渐地。本题是说，今年异常地热。实际情况是，许多人说这是过去30年来最热的天气。故B项正确。