一道英语单选题，求解!!要原因

Question

I am so glad that every thing is going so well as _____
A.plans B.planning C.planned D.to plan

Answer 1

C 我如此开心，因为一切都跟计划的一样好。as it was planned. 把it was 省略了，planned直接过去分词做定语

Answer 2

C 是已经计划好了的，不是正在计划，也不是将要计划。

Answer 3

C. planned 这里是as it was planned 这个句子的简写。