单项选择题

A．who
B．as
C．which
D．what
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问答题
Whether to use tests, other kinds of information, or both in a particular situation depends, therefore, upon the evidence from experience concerning comparative validity and upon such factors as cost and availability.
问答题
The target is wrong, for in attacking the tests, critics divert attention from the fault that lies with ill-informed or incompetent users.
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