What is the best answer for the following test?
When ……….. the report, you are free to leave.
And another question. Is the first part an appositive?
Absolutely share riverkid"s viwpoint. Something is omitted, exactly you're. These sentences without you're don't make any sense, in my way of thinking.
note that the first part is a cluse not a complete sentence
I'd say you can forget C completely. For me, that one is just plain wrong.
If I had to choose, I'd go for A.
I agree with riverkid, though. Neither A nor B seems completely natural.
As to A, B or C, I agree with the other posters: none of them are good English, and 'you' should not be omitted. As for what the questioner may have intended, I suspect the answer was intended to be C for the following reason:
First, transpose the clause to form "You are free to leave when..."
A: "You are free to leave when (you) finished with the report."
B: "You are free to leave when (you) finished the report."
C: "You are free to leave when (you) have finished the report."
C is the correct TENSE (present perfect), although 'you' cannot be omitted. If 'you' is included in C, it is the only correct sentence.
I think the questioner mistakenly believed that you can always omit the pronoun in an adverbial time clause. In fact, you have to change C to:
"When YOU have finished the report, you are free to leave."
In this form, it is the only correct sentence - because the verb it modifies ('to be free') is in the present tense, and so the adverbial clause must be in the present simple or present perfect tense. A and B are in the simple past tense, and so cannot be correct.