单项选择题

You should know better than ______ your little sister at home by herself.

A．to leave
B．leaving
C．to have left
D．left
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单项选择题
All the land was shrouded in one ______ forest.
A．enormous
B．vast
C．gigantic
D．huge
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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