单项选择题

All ______ is a continuous supply of raw materials.

A．what is needed
B．thing needed
C．that is needed
D．is needed
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单项选择题
All the parts of these washing machines are ______ , so that it is very convenient to replace them.
A．normalized
B．modernized
C．mechanized
D．standardized
单项选择题
You can't prescribe before you ______ as a doctor.
A．fit
B．qualify
C．match
D．equal
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