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Option 4 : D

The correct answer is Option 4 as there is no error in the sentence.

Rule- Present perfect continuous tense is used to show that an action started in the past and has continued up to the present moment.For and since is used in these sentences,for is used with a period of time and since is used to refer to specific point in time.

Syntax for Present perfect continuous tense-

Person(Singular/Plural) Auxiliary Verb Verb form to be used(singular/Plural Person)
I/We have been/have been V+ing form/V+ing form
You/You have been/have been V+ing form/V+ing form
He,She,It/They,them has been/have been V+ing form/V+ing form
 

Correct sentence with underlined tenses-The world has been  fighting the corona pandemic for the last three months but the results has differed from country to country and Germany being the best in checking the spread of the virus.

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