单项选择题

A man escaped from the prison last night. It was a long time ______the guards discovered what had happened.

A．before
B．until
C．since
D．when
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单项选择题
After a meal in a restaurant, you ask the waiter for the______.
A．bill
B．note
C．receipt
D．menu
单项选择题
______ you as soon as I know what______.
A．I'll phone.., does happen
B．I'll phone.., has happened
C．I am phoning...happens
D．I am going to phone...happens
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