单项选择题

_________a teacher, one must first be a pupil.

A．Being
B．Having been
C．To be
D．To have been

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单项选择题

But for my classmates’’ help, I________ the work in time.

A．did not finish
B．could not finish
C．will not finish
D．would not have finished

单项选择题

Modern scientific researches have reported to us that_________.

A．fat people eat less food and are less active
B．fat people eat more food than slim people and are more active
C．fat people eat more food than slim people but are less active
D．thin people run less, but have greater increase in food intake

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