单项选择题

Jack is a diligent student.

A. hardworking
B. ambitious
C. lazy
D. slow
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单项选择题
The little girl grasped her mother's arm as she crossed the street.
A. understood
B. had a hold over
C. took hold of
D. left hold of
单项选择题
We've been doing with that company for many years.（）

A. comparing
B. dealing
C. keeping
D. combining
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