Вчера был выходной, поэтому нам не надо было вставать рано.

• a) Yesterday was a day off, so we didn't have to get up early.
• b) Yesterday was a day off, so we did no have to get up early.
• c) Yesterday was a day off, so we not to have to get up early.
• d) Yesterday was a day off, so we have to get up early.