单项选择题


A．take
B．make
C．do
D．be
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单项选择题
________ he works hard, I don't mind when he finishes the experiment.
A．As soon as
B．As well as
C．So far as
D．So long as
单项选择题
Braille, the universally accepted________ of writing used by blind persons, consists of sixty-three characters.
A．catalog
B．system
C．pattern
D．scheme
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