這是家人拿來問我的多益題目，然後我就被考倒了.....
題目：A ___ statistical report has already been sent to the marketing department.
A. completing
B. completed
C. completely
D. to complete
疑問：這題我是選C，原因是statistical是形容詞，所以選C副詞來修飾形容詞
但題目給的答案居然是B!! 想請問為什麼可以用形容詞+形容詞這樣的搭配呢?