______we were worried about was ________they could manage to control the pollution.
A．That howB．That whetherC．What thatD．What whether
D
本題考查名詞性從句。What引導(dǎo)主語從句，從句中缺少賓語，whether引導(dǎo)表語從句，句意：我們所擔(dān)心的是他們能否成功的控制污染。選D。
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