The teacher praised me for progress I'd made, which was great encouragement to me.
A. the; /
B. the; a
C. /; a
D. /; /
网友回答
A. the; /
(答案→)B. the; a
C. /; a
D. /; /
解析：B 句意：老师因为我取得的进步而表扬我，这对我是一个很大的鼓励。progress后有定语从句修饰，意为“我取得的进步”，为特指；第二空a great encouragement意为“一件很鼓舞人的事情”，此处encouragement为可数名词，故选B项。