The correct answer is: D. none of the above
The sentence “We . . . . . . . . adopted a girl” is in the simple past tense. The simple past tense is used to talk about events that happened in the past and are not happening now. The correct verb form to use in the simple past tense is “adopted.”
The verb “were” is in the past tense, but it is not the correct verb form to use in this sentence. The verb “were” is used to talk about events that happened in the past and are not happening now, but it is not used to talk about events that happened at a specific time in the past.
The verb “are” is in the present tense. The present tense is used to talk about events that are happening now or that happen regularly. The verb “are” is not the correct verb form to use in this sentence because the event happened in the past.
The verb “has” is in the present perfect tense. The present perfect tense is used to talk about events that happened in the past and have an effect on the present. The verb “has” is not the correct verb form to use in this sentence because the event happened at a specific time in the past.