单项选择题

A．Because students vary in needs,
B．Because teaching methods vary greatly.
C．Because schools offer different subjects.
D．Because there are different aids at school.
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单项选择题
A．Forty percent.B．Seventy percent.C．Forty five percent.D．Seventy five percent.
A．Forty percent.
B．Seventy percent.
C．Forty five percent.
D．Seventy five percent.
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