Mark the letter

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

A. We used to leave the dog by herself in the house only rarely, and even then would regret it upon our return home.

B. Every time we have to go out, we wonder whether leaving the dog in the house by herself would be a good idea.

C. The moment we opened the door, it became obvious that the dog had not really been alone in the house.

D. We knew leaving the dog at the house by herself had been a bad idea as soon as we opened the door.