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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Last month more than a hundred workers were killed in the mine ______.
A. exploitation
B. explosion
C. explication
D. explosivity
单项选择题
Market research is usually very ______, involving thousands of people answering hundreds of questions.
A. detailed
B. details
C. detail
D. detailing
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