书名：寂天挑战新多益阅读满分1000题
页数：p.67 121.
题目：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
疑问：答案是D 不懂为什么要用副词

楼上大大能否在解析多一些呢 我还是不太懂 谢谢!!谢谢楼上两位大大