题目内容

________ 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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