单项选择题

Someone broke into the house and stole many paintings. It was a long time ______ the housekeeper discovered what had happened.

A．until
B．when
C．since
D．before
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单项选择题
The task before us ______ great courage and perseverance.
A．calls on
B．calls for
C．calls forth
D．calls up
单项选择题
The traditional approach ______ with complex problems is to break them down into smaller, more easily managed problems.
A．to dealing
B．in dealing
C．dealing
D．to deal
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