I have to clean up the room then I’ll come shopping with you.A. FirstlyB. At firstC. To st

问题补充：

I have to clean up the room,then I’ll come shopping with you.

A. Firstly

B. At first

C. To start with

D. First (of all)

答案：

A. Firstly

B. At first

C. To start with

(答案→)D. First (of all)

解析：first （of all）此处表示根据时间顺序依次列出一系列动作，与后面的then相呼应。