单项选择题

After performing a successful operation, the doctor at last pulled the patient ______.

A．back
B．in
C．up
D．through
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单项选择题
Watching me pulling the calf awkwardly to the barn, the Irish milkmaid fought hard to ______ her laughter.
A．hold back
B．hold on
C．hold out
D．hold up
单项选择题
Features such as height, weight, and skin color ______ from individual to individual and from face to face.
A．vary
B．change
C．alter
D．convert
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