单项选择题

Last winter, it snowed ______ but not enough for skiing.

A．constantly
B．accidentally
C．occasionally
D．frequently
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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
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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