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
The book seems to have been ________ from various books and articles.
A．pieced together
B．taken off
C．broken away
D．pulled out
单项选择题
We hadn't met for 20 years, but I recognized her ________ I saw her.
A．for the moment
B．the moment when
C．at the moment when
D．the moment
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