单项选择题

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

A．what is needed
B．for our needs
C．the thing needed
D．that is needed
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单项选择题
She never laughed, ______ lose her temper.
A．or she ever did
B．nor did she ever
C．or did she ever
D．nor she ever did
单项选择题
A new technique ______, the yields as a whole increased by 20 percent.
A．working out
B．having worked out
C．having been worked out
D．to have been worked out
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