问题
选择题
____ 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
答案
答案：D
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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
答案：D