It is estimated__________an automated highway will be able to handle 10,000 vehicles per hour.

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问题 It is estimated__________an automated highway will be able to handle 10,000 vehicles per hour.

选项 A、that
B、whether
C、when
D、what

答案A

解析分析句子结构可知，It是形式主语，真正的主语是空处引导的从句，从句成分和意义完整，所以应用只起连接作用而没有词义的that引导。whether在主语从句中意为“是否”；when在主语从句中作时间状语；what在主语从句中作主语、宾语等成分。故选A。

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英语

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