单项选择题

Braille, the universally accepted system of writing used by blind persons, consists of sixty- three characters（）

A. catalog
B. method
C. committee
D. punctuation

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单项选择题
It （） now pretty late, we took our candles and retired to our room.

A. is
B. being
C. turned
D. got
单项选择题
Four members walked out of the session, with the result that the committee did not have a ______ and would not take any decisions.
A. babe
B. backbone
C. quorum
D. apartheid
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