great efforts to practice English, Mary has made much progress in spoken English.
A. To make
B. Having made
C. Made
D. Making
网友回答
A. To make
(答案→)B. Having made
C. Made
D. Making
解析：
这题考查现在分词的完成式做原因状语从句的用法，句意是：因为努力练习英语，她在口语上已经取得了很大的进步，因为“努力”发生在“进步”之前，所以用现在分词的完成式。选B。