单项选择题

You're very sefish. It's high time you （）. that you're not the most important person world.

A．would realize
B．realize
C．are realizing
D．realized

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单项选择题
（） no gravity, there would be no air around the earth.

A．Were there
B．Was there
C．There were
D．There be.
单项选择题
We depend on the sun's rays. for the light and warmth which （） us alive.

A．keep
B．keeps
C．kept
D．is keeping
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