書名：寂天挑戰新多益閱讀滿分1000題
頁數：p.67 121.
題目：Effort to sell government-owned corporations have been ____ successful
so far,and the privatization effort is moving ahead.
(A)moderate
(B)moderator
(C)moderating
(D)moderately
疑問：答案是D 不懂為什麼要用副詞

樓上大大能否在解析多一些呢 我還是不太懂 謝謝!!謝謝樓上兩位大大