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______we were worried about was ________they could manage to control the pollution.
A.That howB.That whetherC.What thatD.What whether
D
本题考查名词性从句。What引导主语从句,从句中缺少宾语,whether引导表语从句,句意:我们所担心的是他们能否成功的控制污染。选D。
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