单项选择题

One cannot be too careful, ______

A．can one
B．can he
C．can she
D．can they
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单项选择题
One way to conserve water is to ______ dishes, instead of rinsing them, before loading the dishwasher.
A．polish
B．scrub
C．scrape
D．scribe
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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