单项选择题

A．Every weekends.
B．Frequently.
C．Occasionally.
D．Rarely.
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单项选择题
A．effectiverB．effectiveC．more effectiveD．most effective
A．effectiver
B．effective
C．more effective
D．most effective
单项选择题
A．belowB．afterC．beforeD．behind
A．below
B．after
C．before
D．behind
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