单项选择题

All too _________ it was time to go back to school after the Spring Festival.

A．quick
B．soon
C．fast
D．speedy
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A．butB．thenC．andD．however
A．but
B．then
C．and
D．however
单项选择题
In his research at Columbia University, Charles Townes worked with all of the following EXCEPT _________.
A．stimulated emission
B．microwaves
C．light amplification
D．a maser
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