问题
选择题
The suggestion they all objected to________to be effective finally.
A．proving
B．prove
C．had proved
D．proved
答案
答案：D
考察时态.句意,他们都反对的建议最后证明是有效的. they all objected to作定语修饰suggestion,句子主语为suggestion,根据finally,可知句子强调的是过去发生的动作,故用过去时态,选D.