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)
Present perfect tense. Have washed is the verb, Have or Has is used to show an action that has taken place in the present, not quite long or is still taking place
Answer:
I’m going to say the answer is B.
Explanation:
A doesn’t make sense along with D and C could be another option but because it is copyrighted she should just avoid using it at all. Please give me brainliest! Hope this helps! Brainliest! Brainliest! Brainliest!