Answer:
The sentence that uses the past perfect correctly is:
B. We had done the same day after day.
Explanation:
The structure of the past perfect tense is the following:
subject + had + main verb in the past participle
This tense is used to express actions that happened in the past before other actions that also took place in the past. In other words, it refers to a past that is farther away. For example:
I had already finished my meal when you called. → Action that happened first: I finished my meal. / Action that happened later: you called.
Having that in mind, we can see that the correct answer is letter B.
B. We had done the same day after day.
NOTE: Since you did not punctuate or separate the options, I am assuming letter B ends with the word "day".
