A good friend of mine from I was born showed up at my home right before I left for Beijin

问题补充：

A good friend of mine from I was born showed up at my home right before I left for Beijing.

A. how

B. whom

C. when

D. which

答案：

A. how

B. whom

(答案→)C. when

D. which

解析：本题对学生来说较难,不容易看的懂.本句意为”就在我准备去北京前,我儿时的一位好朋友到我家里来了.”