这是家人拿来问我的多益题目，然后我就被考倒了.....
题目：A ___ statistical report has already been sent to the marketing department.
A. completing
B. completed
C. completely
D. to complete
疑问：这题我是选C，原因是statistical是形容词，所以选C副词来修饰形容词
但题目给的答案居然是B!! 想请问为什么可以用形容词+形容词这样的搭配呢?