单项选择题

Racial discrimination has still ______ in some parts of the U.S.A. since it after the Civil War.

A. been existed; has been done away
B. existed; has been done away with
C. been existed; has been done away with
D. existed; was done away with
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单项选择题
We must keep a secret of the things ______ here, the general said ______ at the man in charge of the service office.
A. discussed; and stared seriously
B. being discussed; seriously staring
C. to be discussed; seriously stared
D. having been discussed; and seriously staring
单项选择题
Children may get into some bad habits ______ they lack self-discipline.
A. when
B. unless
C. though
D. until
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