___ help the people in the snowstorm in the south made him worried．
| A．Not known how to | B．Unknown what to do to |
| C．His knowing not how to | D．His not knowing how to |
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___ help the people in the snowstorm in the south made him worried．
| A．Not known how to | B．Unknown what to do to |
| C．His knowing not how to | D．His not knowing how to |
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