7) Yesterday I didn't have breakfast and went to school, while the day before yesterday I had breakfast and went to school. Which of the following sentences can I say without being a liar?

(A) When I have breakfast, I never go to school

(B) every time I go to school, I don't have breakfast

(C) every time I go to school, I have breakfast

(D) sometimes I go to school without having breakfast

(E) when I don't have breakfast, I never go to school.
7) The answer is $(\mathbf{D})$.

Indeed, (A) and (B) are in contradiction with what happened the day before yesterday; (C) and (E) are in contradiction with what happened yesterday. Instead, the answer (D) is compatible with what has been verified both yesterday and the day before yesterday.