70.Gilbert often attends online public lectures_____his horizons.
答案解析
解析：
分析句子结构并结合句意可知,空处应用不定式,和空后的 his horizons一起作目的状语,可排除 A项:C项是不定式的完成式,表示 broaden这一动作发生在调语动河 attends所表示的动作之前,不行合题意;另外broaden 与其逻辑主语 Gilbert之间为主调关系,所以应用不定式的一般式,可排除D项。故选B。
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