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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单项选择题
Thousands. of young people have learned ______ cars.
A. drive
B. driving
C. drove
D. to drive
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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