作者：英吉
Recent research indicates that two popular arthritis drugs are possibly not as safe as they initially 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
原文意思：最近的研究指出两种药可能不象原先想的那样安全。
题目分析：A干掉，因为时as后面的they指代的应该是药物，但是药物被认为是安全的，不能用主动。
B用被动，留着。C中的it指代不了前面的drugs，干掉。D也一样用了it，杀。E就不是药物进行比较了，而是safety和后面的药物进行比较了，杀。
