单项选择题

This experiment ought to ______ last week.

A．be done
B．have been done
C．have done
D．do
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单项选择题
Our singing group is going to give a ______ performance next Wednesday. Don't miss it!
A．live
B．living
C．lively
D．lovely
单项选择题
In some restaurants, food and service are worse than ______ used to be.
A．they
B．it
C．them
D．that
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