单项选择题

Mr. Smith had an unusual______: he was first an office clerk, the a sailor, and ended up as a school teacher.

A．profession
B．occupation
C．position
D．career
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单项选择题
This is an exciting area of study, and one ______ which new applications are being discovered almost daily.
A．from
B．by
C．in
D．through
单项选择题
As teachers we should concern ourselves with what is said, not what we think ______.
A．ought to be said
B．must say
C．have to be said
D．need to say
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