单项选择题

Now ______ of students has reduced because ______ of students have graduated recently.

A．the number; number
B．number; a number
C．a number; the number
D．the number; a number
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单项选择题
______ !There's a little pool on your side.
A．Look out
B．kook over
C．Look aside
D．Look on
单项选择题
It is said in the book that Thomas Edison ( 1847 ～ 1931 ) ______ the world leading inventor for sixty years.
A．would be
B．has been
C．had been
D．was
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