单项选择题

He said ______ was not within his power to answer the question.

A．that
B．this
C．such
D．it
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单项选择题
______ had made great contributions to science is a fact.
A．What he
B．Which he
C．He
D．That he
单项选择题
It is not difficult to teach ______ students.
A．smart
B．fashionable
C．sensitive
D．vital
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