题目内容
___ 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
D

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题目内容
___ 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
D