题目列表(包括答案和解析)
When he knocked at the door, my mother was busy ____ supper.
A. preparing for B. in preparing
C. to prepare for D. to prepare
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
When he knocked at the door, my mother was busy ____ supper.
A. preparing for B. in preparing
C. to prepare for D. to prepare
When he knocked at the door, my mother was busy ____ supper.
A. preparing for B. in preparing
C. to prepare for D. to prepare
When he knocked at the door, my mother was busy ____ supper.
A. preparing for B. in preparing
C. to prepare for D. to prepare
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