单项选择题

To know what is good and ______are two different things.

A．doing what is right
B．to do what is right
C．did what was right
D．to do what was right
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单项选择题
He must have heard of the bad news, ______can be perceived in his expression.
A．as
B．what
C．while
D．that
单项选择题
They have to adjust in ______way that they don't make a loss.
A．a such
B．such
C．such a
D．so
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