单项选择题
As a salesman, he works on a (an) ______ basis, taking 10% of everything he sells.
A．salary
B．pension
C．commission
D．income
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单项选择题
It is said that a grave of a middle aged man ______ about 2,300 BC was found by some English archaeologists in the year of 2002.
A．dating back
B．dated back to
C．dating back to
D．dated from
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单项选择题
I'll show my ______ to you as soon as they come out.
A．photos
B．photoes
C．a piece of photo
D．pieces of photoes
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