单项选择题

Nationas are classified as "______" when seven percent or more of their people have reached 65.

A．aging
B．being aging
C．aged
D．being aged
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单项选择题
It is requested that an applicant whose undergraduate work is done at another institution_ _____two copies of undergraduate transcripts and degrees directly to the dean of the graduate school.
A．must send
B．send
C．are to send
D．need send
单项选择题
In vain______ to get in touch with the authorities.
A．they tried
B．did they try
C．they have tried
D．the had tried
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