◎ 题干
_____ we were worried about was _____ they could manage to control the pollution.
[     ]
A. That; how      
B. What; whether
C. That; whether  
D. What, that.
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“_____ we were worried about was _____ they could manage to control the pollution. [ ]A. That; howB. What; whetherC. That; whether D. What, that.…”主要考查了你对  【连接代词】【主语从句】【表语从句】  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。