单项选择题

The little boy had no choice but to look on ______ as his mother was seriously injured in the traffic accident.

A. help
B. helpless
C. helpness

D. helplessly
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It is necessary to find a peaceful ______ to the troubles in the area.
A. solution
B. answer
C. way

D. explanation
单项选择题
Last month more than a hundred workers were killed in the mine ______.
A. exploitation
B. explosion
C. explication
D. explosivity
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