单项选择题

The integration of staff for training has led to a good exchange of ideas, greater enthusiasm, and higher staff ______.

A．moral
B．mortal
C．morale
D．mores
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单项选择题
Attempts to persuade her stay after she felt insulted were ______.
A．of no avail
B．out of focus
C．queerly
D．in no way
单项选择题
There are a few small things that I don't like about my job, but ______ it's very enjoyable.
A．all at once
B．once and for all
C．so much as
D．by and large
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