believed.
(A) that two popular arthritis drugs are possibly not as safe as they initially believed
(B) that two popular arthritis drugs may not be as safe as they were initially believed to be
(C) two popular arthritis drugs to possibly not be as safe as it was initially believed
(D) the safety of two popular arthritis drugs may not be as great as it was initially believed
(E) the safety of two popular arthritis drugs not to be as great as they were initially believed to be
答案是B. 我感觉A似乎更对一些.
笔记上的解释是：
(A) they没有指代对象，因为用的是主动语态they believed…，如果they指代drugs，则必须用被动语
态。
(B) 正确，that 引导宾语从句说明indicate 的内容，as 在这里的作用更类似连词，连接一个主句和一
个从句。
我感觉它的解释不是很正确. A选项的they可以指代drugs，后边的initially believed完全可以做一个-ed分词做drugs的定语啊.这样不就通了.they后面省略了be动词were；
B选项乍看一下，它的前后结构其实是不怎么平行的。前面是may not be 后边是 were believed to be
我有点乱，求NN们给个更好的分析解释吧，谢谢了
-- by 会员 wly1202m (2012/5/3 13:33:52)