单项选择题

Only when they are injured______.

A．will some animals attack a human being
B．a human being will be attacked by some animals
C．some animals will attack a human being
D．that some animals attack a human being
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单项选择题
When traveling in a foreign country, one should be careful to carry ______ at all times.
A．their passports
B．your passport
C．his passport
D．her passport
单项选择题
—Do you smoke—I______, but I quit.
A．used to do
B．used to
C．used to doing
D．used
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