单项选择题

I know Joanna quite well and never doubt ______ she can do a good job in her new position.

A．whether
B．that
C．if
D．when
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单项选择题
That man must be blind, ______ he is feeling his way about.
A．so
B．since
C．for
D．because
单项选择题
I couldn't be mistaken; I ______ heard the loudspeaker calling passengers for the flight to New York.
A．distastefully
B．distinctively
C．distinctly
D．disgustingly
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