单项选择题

All ______ is a continuous supply of the basic necessities of life.

A．what is need
B．for our needs
C．the thing needed
D．that is needed
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单项选择题
Susan wants to know whether the measures have been agreed
A．to
B．with
C．over
D．on
单项选择题
______ their homework, the children went for a walk.
A．When they were doing
B．After they have done
C．Having done
D．received...didn't accept
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