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
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单项选择题
It is not difficult to teach ______ students.
A．smart
B．fashionable
C．sensitive
D．vital
单项选择题
The man was sent to prison for six months, ______ guilty of theft.
A．being found
B．having been found
C．having found
D．to have been found
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