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
Her husband died in a traffic accident, ______ five kids with her.
A. left
B. leaving
C. leave
D. being left
单项选择题
______ enough preparations, we decided to put off the meeting.
A. Having not make
B. Not having made
C. Not made
D. Making not
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