摘要： When he knocked at the door, my mother was busy supper. A. preparing for B. in preparing C. to prepare for D. to prepare
网址：http://m.1010jiajiao.com/timu3_id_2503577[举报]
When he knocked at the door, my mother was busy ____ supper.
A. preparing for B. in preparing
C. to prepare for D. to prepare
查看习题详情和答案>>34. When he knocked at the door, my mother was busy ____ supper.
A. preparing for B. in preparing
C. to prepare for D. to prepare
查看习题详情和答案>>When he knocked at the door, my mother was busy ____ supper.
A. preparing for B. in preparing
C. to prepare for D. to prepare
查看习题详情和答案>>