Did you leave the doors and windows firmly______?You know there are many burglars there days.

分类: 作业答案 • 2022-03-01 22:21:11

问题描述：

Did you leave the doors and windows firmly______?You know there are many burglars there days.
A to fasten B to be fastened
C fastened D fastening

答

C 被动语态而to be不定式表示将来.此为过去式