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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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热门试题

单项选择题External dangers usually enforce ______ harmony and subordination.

A．inside
B．inner
C．internal
D．interior

单项选择题A．of courseB．thereforeC．indeedD．as such

A．of course
B．therefore
C．indeed
D．as such