单选题 After reading his daughter's letter, the old man was so disappointed that he tore it into pieces with trembling fingers.
【正确答案】 A
【答案解析】[译文] 老人读完女儿的信后失望至极，竟用颤抖的手指把它撕得粉碎。 [解析] 本句包含两个状语，一为由“介词after+现在分词短语”构成的状语，二为so that引起的结果状语从句。