I had a diffcult time ( )my homework yesterday . A.do B.to dou C._英语解答

I had a diffcult time ( )my homework yesterday . A.do B.to dou C.doing. D.die
解释理由

人气：377 ℃　时间：2019-08-18 06:58:17

解答

C.doing 固定搭配had a diffcult[hard] time (in )doing sth/sth[作某事有困难或不容易]