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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单项选择题
As it turned out to be a problem of no importance, we______so much time look- ing into it.
A．needn't spend
B．didn't have to spend
C．oughtn't to spend
D．needn't have spent
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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