单项选择题

I'm late, ______ I

A．am not
B．am not
C．isn't
D．aren't
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单项选择题
Water is an essential global resource and it is up to each of us to ______ it.
A．preserve
B．maintain
C．reserve
D．conserve
单项选择题
Divorce should not be the only solution. You may work ______ your personal differences and similarities first.
A．out
B．in
C．off
D．on
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