单项选择题

A．when
B．if
C．as if
D．as
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单项选择题
Mr. Chretien is the ______ Canadian leader to visit Cuba in more than 20 years.
A．first
B．second
C．third
D．fourth
单项选择题
A．NeverthelessB．SoC．ThereforeD．For example
A．Nevertheless
B．So
C．Therefore
D．For example
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