Fill in the blank with the most appropriate option.
How long______Mr. Brown?

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Do you know

Did you knew

Have you known

Will you known

answer is C.

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Detailed Solution

Concept- How long have you known Mr. Brown.
The words ‘ how long ’ relate to asking the time period over which an action happed. This means that the action in the given judgment has happed now, but also refers to the history so as to establish a link between them. In this case, only the present perfect tense can be used.
The present perfect is a verb tense which is used to show that an action has taken place formerly or numerous times before now. The present perfect is most constantly used to talk about gests or changes that have taken place, but there are other less common uses as well. This tense is formed by have has the once participle.
Now, we know what we're looking for, let’s look at the available options
( 1) do you know- This expression is in the simple present tense. It isn't in the present perfect tense, it doesn't fit into the environment of the given judgment . This isn't the needed answer. So, this is an incorrect option.
( 2) did you knew- This expression is grammatically incorrect. It isn't in the present perfect tense, it doesn't fit into the environment of the given judgment . This isn't the needed answer. So, this is an incorrect option.
3) have you know- This expression is in the present perfect tense. This fits impeccably into the given judgment . This is the needed answer. So, this is the correct option.
4) will you known This expression is grammatically incorrect. It isn't in the present perfect tense, it doesn't fit into the environment of the given judgment . This isn't the needed answer. So, this is an incorrect option.
Hence , the correct answer is option 3

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