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

There was such a long line at the exhibition （） we had to wait for about half an hour.

A．as
B．that
C．so
D．hence

单项选择题

In the Chinese household, grandparents and other relatives play （） roles in raising children.

A．incapable
B．indispensable
C．insensible
D．infinite

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