单项选择题


A．when
B．then
C．where
D．and
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单项选择题
A．childrenB．peopleC．teachersD．parents
A．children
B．people
C．teachers
D．parents
单项选择题
A．helpedB．watchedC．listenedD．supported
A．helped
B．watched
C．listened
D．supported
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