单项选择题

In vain ______ to get in touch with the Embassy.

A．they tried
B．tried they
C．did they try
D．they have tried
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单项选择题
The juvenile delinquent was released in ______ of his good behavior.
A．case
B．way
C．view
D．event
单项选择题
When the crowd saw the prize-fighter stretched out on the canvas, shouts and cheers ______ from it.
A．broke up
B．broke forth
C．broke through
D．break upon
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