A few years ago, it ____ that certain cells of the human body never _____.*1 pointa) has been found / diedb) had been found / diesc) was found / died) is found / died
Question
A few years ago, it ____ that certain cells of the human body never _____.*1 pointa) has been found / diedb) had been found / diesc) was found / died) is found / died
Solution
The correct answer is c) was found / die.
This is because the first part of the sentence is in the passive voice, past simple tense, which requires the form 'was/were + past participle'. The verb 'find' in past participle is 'found'.
The second part of the sentence requires the base form of the verb 'die' because it is used to express a general fact or scientific fact, which is usually expressed in the simple present tense.
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