单项选择题

His career was not noticeably ______ by the fact that he had never been to college.

A．prevented
B．prohibited
C．hindered
D．refrained
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单项选择题
An early type produced letters quickly and neatly; the typist, ______ , couldn't see his work on this machine.
A．however
B．therefore
C．although
D．anyhow
单项选择题
He advised Mary ______ anyone about the shortages.
A．not telling
B．not tell
C．tell not
D．not to tell
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