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单项选择题

A．even
B．though
C．unless
D．if
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单项选择题A．prosperousB．rigorousC．vigorousD．gorgeous

A．prosperous
B．rigorous
C．vigorous
D．gorgeous

单项选择题A．He must change the flight at Jacksonville.B．He has to change the flight at Albany.C．He will fly for two hours.D．He will fly directly to his destination.

A．He must change the flight at Jacksonville.
B．He has to change the flight at Albany.
C．He will fly for two hours.
D．He will fly directly to his destination.