问题
选择题
In 2009 many countries are going through financial crisis，________has a great effect on many walks of life.
A．it
B．which
C．that
D．what
答案
答案：B
考查定语从句。which引导非限制性定语从句，指代前面整个一句话。that不能引导非限制性定语从句。
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