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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
考查非謂語動(dòng)詞。題中缺少主語，從四個(gè)選項(xiàng)中看出可用動(dòng)名詞做主語，排除A和B，分詞的否定式，not 應(yīng)放在分詞的前面。所以選D。
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