the plan has been made let’s get down to it out.A. Now that...carryB. Because...carryC.

问题补充：

the plan has been made, let’s get down to it out.

A. Now that...carry

B. Because...carry

C. Since...carrying

D. Now...putting

答案：

A. Now that...carry

B. Because...carry

(答案→)C. Since...carrying

D. Now...putting

解析：get down to doing sth. to为介词，开始认真做某事，前空“既然”的意思。