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
A state with more ______ instruments in its hands will find that with small men no great thing can really be accomplished.
A．tractable
B．mild
C．docile
D．controllable
单项选择题
Mortgages are hard to come ______ since banks are more cautious.
A．with
B．in
C．by
D．through
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