<span>the answer among all other answer will be answer C.
</span>
Answer:
Since the middle of the 20th century, scientists <u>have found</u> cures for many diseases. However, so far no one <u>has discovered</u>
Explanation:
those are the perfect tenses for (find) and (discover)
Answer:
The murderer thinks he hears the heartbeat of the man he killed and he givs himself away
Explanation:
I believe that the answer should be D. it makes a sentence more lively.
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