题目

___ young man , first he worked in a shop and later in a post office .   　　A. Being a B. When he was C. As a D. Be a   答案： C 答案B少冠词a，答案D是祈使句，显然是错误的。答案A中being通常表示原因，因此不合题意。As a young man 在这里相当于When he was a young man，表示时间。

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