单项选择题

Not until a baby kangaroo is four months old ______ to live outside its mother's pouch.

A．it begins
B．he begins
C．is he beginning
D．does it begin
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单项选择题
Whenever we are in trouble, we can ______ him for help.
A．turn down
B．turn to
C．turn out
D．turn up
单项选择题
The snakes will attack only if you take it ______ surprise.
A．in
B．by
C．with
D．on
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