单项选择题

I catch cold now and then.

A. always
B. occasionally
C. constantly
D. regularly
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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
Many of novelist Carson McCullers' characters are isolated, disappointed people.
A. solitary
B. gloomy
C. feeble
D. frugal
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