单项选择题

______ all the inventions have in common is ______ they have succeeded.

A．That…what
B．What…that
C．That…that
D．What…what
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单项选择题
--Where did you have your supper--______.
A．With my uncle
B．At my uncle home
C．At my uncle
D．At my uncle's
单项选择题
The reason ______ they died was lack of medical care.
A．which
B．at which
C．in which
D．why
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