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________ help the people in the snowstorm in the South made him worried.
A.Not known how toB.Unknown what to do to
C.His knowing not how toD.His not knowing how to
D
考查非谓语动词。题中缺少主语,从四个选项中看出可用动名词做主语,排除A和B,分词的否定式,not 应放在分词的前面。所以选D。
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