单项选择题

Eye contact is important because wrong contact may create a communication _______.

A．tragedy
B．vacuum
C．question
D．barrier
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单项选择题
It seems very difficult ______.
A．to stop the child to cry
B．restraining the child to cry
C．to stop the child from crying
D．holding the child' s crying
单项选择题
Fruit is rich ______ vitamins.
A．with
B．in
C．at
D．of
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