单项选择题

The two scholars worked at the task of writing a preface to the new dictionary for three hours ______ last night.

A．at length
B．in full
C．on end
D．in time
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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．broke upon
单项选择题
______ the examinations are over, we can all relax.
A．While
B．Even though
C．For
D．Now that
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