摘要：Understanding the cultural habits of another nation, especially containing as many different cultures as America is a difficult thing. A. the one B. one C. it D. either
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（2010·长春模拟) she is not so cheerful she used to be?
A. How is it that；as B. Why is it that；what
C. Is it why；that D. How it is that；as
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（2010·长春模拟) she is not so cheerful she used to be?
| A．How is it that；as | B．Why is it that；what |
| C．Is it why；that | D．How it is that；as |