My grandfather us stories when I was young.A. was used to tellB. is used to tellingC. used

问题补充：

My grandfather us stories when I was young.

A. was used to tell

B. is used to telling

C. used to tell

D. used to telling

答案：

A. was used to tell

B. is used to telling

(答案→)C. used to tell

D. used to telling

解析：be used to sth习惯于某事;used to do sth过去常常做某事. sth be used to do sth某物被用来做某事。get used to习惯于某事。句意：当我小的时候，我的爷爷常常给我们讲故事。结合语境可知选C。