Select appropriate option to fill in the blank:
The light was off when I left the room. Now it is on. Somebody ______________________.

has turned on the light

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will have turned on the light

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had turned on the light

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was turning on the light

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Solution

The correct option is A has turned on the light
The present perfect is a verb tense which is used to show that an action has taken place once or many times before now, here, turning on the light. The present perfect is formed using has/have + past participle, here, "has turned on". Hence, Option A is correct.
The rest of the options do not express this condition. They either mention actions that have already happened (options C and D) or actions that are yet to happen in the near future (option A).
Hence these options are incorrect.

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Select appropriate option to fill in the blank:The light was off when I left the room. Now it is on. Somebody ______________________.

Select appropriate option to fill in the blank:
The light was off when I left the room. Now it is on. Somebody ______________________.