单项选择题

All ______is a continuous supply of electric power.

A．that is needed
B．what is needed
C．which is most important
D．for our needs
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单项选择题
We agreed to accept ______ they thought was the best tourist guide.
A．whatever
B．whomever
C．whichever
D．whoever
单项选择题
Many things have happened ______ I saw you.
A．when
B．before
C．since
D．for
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