Select the correct active form of the given sentence.

Before she came all the work had been completed by me.

I had completed all my work before she came.

The correct active form of the given sentence "Before she came all the work had been completed by me" is I had completed all my work before she came.

The passive voice of the sentence is Before she came all the work had been completed by me. This sentence is in the past perfect tense, which is used to describe an action that happened in the past before another action happened. The active voice of the sentence is formed by putting the subject of the passive sentence before the verb and adding the word "by" before the agent. In this case, the subject of the passive sentence is "work" and the agent is "me." So, the active form of the sentence is I had completed all my work before she came.

The other options are incorrect because:

• I will complete all my work before she came. is in the future tense, but the action of the work being completed happened in the past.
• I completed all my work before she came. is in the simple past tense, but the past perfect tense is more appropriate because the action of the work being completed happened before another action happened (she came).
• I complete all my work before she came. is in the present tense, but the action of the work being completed happened in the past.
• I would complete all my work before she came. is in the past conditional tense, which is used to describe an action that would have happened in the past if another action had happened. There is no other action mentioned in the sentence, so the past conditional tense is not appropriate.