单项选择题

Never has a scientific explanation emerged, ______ someone somewhere has objected to it.

A．that
B．which
C．whom
D．but
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单项选择题
His mother frequently denies him permission to do things, and that is ______.
A．ever
B．this
C．that
D．over
单项选择题
Due in large part to the complexity of its structure--over two hundred bones ______ together by ligaments--the human skeleton is a marvel of architectural construction.
A．binding
B．bound
C．bounded
D．bind
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