单项选择题

The professor's speech ______ a wide range of subjects from drug abuse to women's rights.

A．contained
B．covered
C．listed
D．touched
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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
单项选择题
That man must be blind, ______ he is feeling his way about.
A．so
B．since
C．for
D．because
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