单项选择题

I catch cold now and then.

A．always
B．occasionally
C．constantly
D．regularly
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单项选择题
The workers finally called off the strike.
A．put off
B．ended
C．cancelled
D．participated in
单项选择题
Below 600 feet ocean waters range from dimly lit to completely dark.
A．inadequately
B．hardly
C．faintly
D．sufficiently
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