单项选择题

Mandela was ______ first President elected in ______ South Africa.

A．a; the
B．the; x
C．a; x
D．the; the
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Were you ______ the phone a lot this afternoon I tried calling you five times and always got a busy signal.
A．on
B．in
C．at
D．by
单项选择题
The student ______ a very good question about the importance of security in the big cities.
A．rose
B．raised
C．rise
D．had raised
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