单项选择题

How can you ______ and watch them being ill-treated like that

A．stand back
B．stand by
C．stand for
D．stand aside
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单项选择题
These compounds could not have been formed if the chemical reaction ______ stopped.
A．have been
B．has been
C．had been
D．were
单项选择题
The old man and his dog were ______ to each other.
A．supported
B．helped
C．relied
D．devoted
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