单项选择题
If laid out in（）straight line,（）human digestive tract would measure approximately thirty-foot long.
A．a...the
B．/...the
C．the.../
D．the...a
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Since（）beginning of photography,（）inventors have tried to make（）photographs that duplicate（）natural colors.
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He is very famous. He is（）poet and（）novelist.
A．a...a
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