单项选择题

He studied hard at school when he was young, ______ contributed to his success in later life.

A．which
B．that
C．what
D．each of which
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单项选择题
The teacher has his students ______ a subject report every month.
A．to write
B．written
C．writing
D．write
单项选择题
Not a sound ______ while the professor was giving a speech.
A．the students utter
B．the students uttered
C．did the students uttered
D．did the students utter
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