单项选择题

The outline of the figure was barely ______ in the darkness.

A．susceptible
B．invisible
C．perceptive
D．perceptible
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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
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
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