单项选择题

No case is on record of a ______ being ceasing to be ______ under cultivation.

A．variable, variant
B．variant, variable
C．varied, various
D．variable, variable
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单项选择题
Only today ______ known to public.
A．the news were
B．the news was
C．were the news
D．was the news
单项选择题
The success of the project stands ______ management's support of it.
A．down
B．by
C．for
D．on
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