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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单项选择题
—Dear me ! I've been in America for a month.— ______ you are settled, why don't you take up some serious study
A．If
B．Now that
C．When
D．Even if
单项选择题
You must explain __ how they succeeded __ the experiment.
A．of us; for
B．at us; at
C．to us; in
D．for us; to
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