◎ 题干
There is no doubt _____ a high-speed maglev train is very good, but I doubt _____ it will do harm to
 the environment.

[     ]

A. that; whether
B. whether; that
C. that ; that
D. whether; whether
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“There is no doubt _____ a high-speed maglev train is very good, but I doubt _____ it will do harm tothe environment.[ ]A. that; whether B. whether; that C.…”主要考查了你对  【连接代词】【同位语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。