单项选择题

He has been asked to account _______ his absence.

A．for
B．on
C．of
D．about
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单项选择题
All _______ is a continuous supple of raw materials.
A．what is needed
B．thing needed
C．that is needed
D．is needed
单项选择题
The prisoner has been _______ of many privileges that average citizens enjoy.
A．ensured
B．informed
C．deprived
D．convinced
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