单项选择题

The DNA test, together with other tests, ______ the prisoner's innocence.

A．proves
B．prove
C．proving
D．have proved
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How many choices do you have concerning the payment
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单项选择题
Which of the following best describes the purpose of a sound program of educational research
A．To develop teaching theories.
B．To avoid the harm of competition with research.
C．To develop teaching techniques.
D．To help professors improve competencies.
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