单项选择题

We don't doubt ______ he can do a good job.

A．whether
B．that
C．how
D．why
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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
--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
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