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

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单项选择题

For nearly two hours I waited to buy a ticket for the con cert, only ______ that all tickets had been sold out.

A．being told
B．I was told
C．to be told
D．was told

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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