单项选择题

It ______ 12 rabbits to test a sample of vaccine, now it takes only 6.

A．used to taking
B．used to take
C．is used to take
D．was used to taking
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单项选择题
______ in the strange city, the poor boy fell to
A．Lost... crying
B．Lost... cry
C．Having been lost... cry
D．To lose... crying
单项选择题
______ you go there early, there won't be much a chance of getting a ticket.
A．Until
B．If
C．Unless
D．If only
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