单选题
21.
______, our next step is to determine how to carry it out.
A、
The plan having been made
B、
Making the plan
C、
The plan being made
D、
Having made the plan
【正确答案】
A
【答案解析】
the plan having been made“计划已经制订出来”，完成式分词独立结构作状语表示原因。
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