答案B. A项"如果不";C项"如果有一些";D项"如果这样";B项"如果曾经";在这里"if ever"是一个省略结构,根据句意"如果气温曾经有过达到30度"可以理解成"If the temperature has ever reached 30℃"(如果气温曾经有过达到30度),因此B项符合语境, 故选:B。
202839.(2020•西工大附中•四模)
The basic model function of the hero seems to remain constant, _____________ the precise qualities of hero may vary over time.( )