-- I’m so sorry for breaking the plate Mom. It doesn’t matter careful next time.A. Be

问题补充：

-- I’m so sorry for breaking the plate, Mom.

-- It doesn’t matter． careful next time.

A. Being

B. Do be

C. Do

D. To be

答案：

A. Being

(答案→)B. Do be

C. Do

D. To be

解析：句意：妈妈，很抱歉打碎了盘子。没关系，下次一定要小心。Do 后面加动词原形，表示强调，意为的确，确实，题中careful 为形容词，所以用be动词，故选B。