单项选择题


A．On
B．In
C．To
D．At
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单项选择题
A．recallB．to recallC．recallingD．recalled
A．recall
B．to recall
C．recalling
D．recalled
单项选择题
In the west, people make______ a rule to send Christmas present to their relatives and friends.
A．this
B．that
C．it
D．the following
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