单项选择题

A．Every weekends.
B．Frequently.
C．Occasionally.
D．Rarely.
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A．slip upB．show upC．slow downD．slip down
A．slip up
B．show up
C．slow down
D．slip down
单项选择题
A．althoughB．whileC．asD．since
A．although
B．while
C．as
D．since
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