John Wood，an Internet blogger，discovered that Samsung for not protecting its workers from a dangerous chemical used on its phones.
A. had criticized
B. had been criticized
C. was criticized
D. was criticizing
网友回答
A. had criticized
(答案→)B. had been criticized
C. was criticized
D. was criticizing
解析：句意：John Wood，一个互联网博主，发现三星公司因为没有保护自己的工人免受用于手机上的一种危险化学品的危害而受到指责。criticize和Samsung为动宾关系，应该使用被动语态，同时criticize这一动作发生在discovered这个动作之前，故应该使用过去完成时。