单项选择题
Strange ______ his behavior may be, there is a very good reason for it.
A．although
B．even if
C．as
D．that
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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
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