问题详情：
Last week I met my old friend Li Ming by accident but I forgot _____ him for his telephone number.
A. ask B. asking C. to ask
【回答】
C。句意：上周我偶然遇见我的老朋友李明, 但是我忘记向他要他的电话号码了。forget后可跟不定式或v. -ing的形式, forget to do sth. 忘记去做某事, forget doing sth. 忘记做过某事。
知识点：非谓语动词
题型：选择题
