问题补充:
the letter, tears kept coming to her eyes.
A. To read
B. Reading
C. She was reading
D. While she was reading
答案:
A. To read
B. Reading
C. She was reading
(答案→)D. While she was reading
解析:考查状语从句。句意:当她读这封信时,眼泪不断地留出他的眼睛。不定式和分词作状语都和句子主语有一定得逻辑关系,句子只有一个主语。根据句子中的逗号,可知前文表示的是下文的时间条件关系,应用引导词,故选D,时间状语从句。