单项选择题

Sometime the 3-year-old child has trouble______fact from fiction.

A. separating
B. to separate
C. having separated
D. for separating
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单项选择题
After the accident she suffered brain______and couldn’t speak.
A. destruction
B. disease
C. decay
D. damage
单项选择题
We must take part in physical labor in order to ______ ourselves more closely with the working people.
A. identify
B. incorporate
C. combine
D. involve
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