单项选择题


A．recall
B．to recall
C．recalling
D．recalled
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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
单项选择题
He said that books on ______ popular science are in ______ short supply.
A．the; a
B．/; /
C．/; the
D．the; the
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