单项选择题

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
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The student ______ a very good question about the importance of security in the big cities.
A．rose
B．raised
C．rise
D．had raised
单项选择题
That child is ______ take care of himself.
A．enough old to
B．enough old
C．old enough
D．old enough to
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