John Wood，an Internet blogger，discovered that Samsung ________ for not protecting its workers from a dangerous chemical used on its phones.
A．had criticizedB．had been criticized
C．was criticizedD．was criticizing
B
句意：John Wood，一個互聯(lián)網(wǎng)博主，發(fā)現(xiàn)三星公司因為沒有保護自己的工人免受用于手機上的一種危險化學(xué)品的危害而受到指責(zé)。criticize和Samsung為動賓關(guān)系，應(yīng)該使用被動語態(tài)，同時criticize這一動作發(fā)生在discovered這個動作之前，故應(yīng)該使用過去完成時。
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