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Can you please check the answer of this question?

A test for the disease …………… already, but the new one will be quicker and cheaper.

a. exists
b. has existed
c. is existing
d. has been existed

I have doubt between choices a and b

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    What do you think the answers mean? Why do you think either A or B is the correct answer? What concerns do you have about choosing one over the other?
    – randomhead
    Nov 6, 2021 at 16:50
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    because of the adverb "already" Nov 6, 2021 at 16:53
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    Only one of these answers is grammatically wrong, D, but the choice between the rest is which works best and makes the most sense. Do you know about the difference between simple present tense, present perfect, and continuous? Nov 6, 2021 at 20:04
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    'already' could be placed before or after the verb 'exists'. A is the best choice. It seems that an answer to this question already exists, but @AndrewTobilko chose to put it in the comments.
    – Sam
    Nov 7, 2021 at 11:37

1 Answer 1

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Option D is incorrect because of the passive voice.

Options A, B, and C are grammatically sound.

Exist is a stative verb. It's not usually used in the present continuous form. A test is existing already sounds awkward unless you deliberately try to stress the continuity.

has existed would make more sense if you tried bringing attention to the past, e.g. It has existed since the early 2000s.

A looks the best to me because the sentence is about the present and the future developments.

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