单项选择题

They hung ______ at home waiting for a phone call and consequently missed the train.

A．up
B．back
C．about
D．down
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单项选择题
Are you ______ of travel
A．sure
B．proud
C．certain
D．fond
单项选择题
The result of the experiment was not ______ to publish.
A．interesting enough
B．too interesting
C．enough interesting
D．so interesting
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