问题描述：
having done和doing在句首的区别?
＿＿so many difficulties,the people in Wenchuan are still trying their best ti rebuilt their hometown optimistically.
A.Faced B.Having faced C.To face D.Facing
可以的话 分析一下每一个选项
＿＿so many difficulties,the people in Wenchuan are still trying their best ti rebuilt their hometown optimistically.
A.Faced B.Having faced C.To face D.Facing
可以的话 分析一下每一个选项
问题解答：
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